Hello everyone... if this is long, it's because I'm dying inside, and the issue is draining my energy. I wake up to it, and sleep on it. I have been neglecting myself harshly because of it

i have this issue that has been in my mind for 5 months, it's driving me crazy...I'm 29 from Montreal, Canada, and she is 22 from West Palm Beach in Florida. it is important to keep in mind that due to my upbringing, and lack of experience, I cannot emotionally fall for a girl who had been intimate with men. I will sound like a hypocrite especially that I do have a sexual life now, but will not truly fall for someone who has a past...

about her; an asexual girl that likes attention, a lot. she is also friendly, polite and intelligent, graduating psychology and planning to do masters, and shy, she can turn red at anything. Can be sneaky, her mood changes fast, clingy at times, which she recognizes. Again, she loves attention.
I have known this girl from online for 5 years now. met her in 2012, finally met in person after 4 years of knowing each other and lost our virginities. We have been a couple for most of these years. I became more and more comfy being with this girl, seeing the amount of time I spent with her
on April, this year, she told me as ex came to see her at work and she felt really weird so she had to tell me or else she would have felt like she is cheating on me – because of how she reacted, she thought she had something for him, but its not the case as time passed on - which I truly appreciate of her. I asked her if he ever whipped his **** out, and she said yes...he did it 3 times, this kinda changed how I see her now.
this happened to her when she was 15, and the guy was also 15, she been to his house about 9 times, and he took his **** out 3 times when she would go there, when she told him to put it back, he did... but it still hurts
the first time he did it was maybe the second or third time she got to his place, about a month and a half of them being together, and he knew her as a friend for a month, so after 2 and half months of knowing one another. anyways, they were kissing, like pecks, not even tongues, and bam he stops kissing her and takes it out, she told him to put it away - he did- and she got so uncomfortable that she had to take a moment and go to the bathroom, talk herself into thinking that the incident is not a big deal, and to avoid awkwardness as well, and then returned back and they continued to chill on the couch, he texted her later on her way home to have a goodnight and that he’ll see her tomorrow. the next day was weird between them but then it got normal again. the second time he did it was literally out of the blue, she was writing his school paper and he just took it out. The third time they were kissing and he took it out while she was on his lap. After this specific incident, he never talked to her again and she never bothered to contact him till she saw him with another girl and it was time to break up, the relationship lasted from august till December. He never apologized for any of these times he did that, or how he broke up with her
it's important to notice that she didn’t like him like a bf, she looked at him more like a friend. she liked his personality and liked to spend time with him, but more than that, she loved the attention he gave her. She ultimately told me that if she didn’t feel good over all, she wouldn’t have been with him
it's the only thought on my mind all day, every day. I look at guys and wonder if they ever did something like that, I’m starting to hate males because of it. it’s a painful feeling while I’m with her, or on break from her.. I know rape exists and sexual violation as well, also some guys do send **** pix – she had this happened to her from a classmate, but I didn’t mind because nothing she can do – but seriously, at 15 years old a guy just whips out his **** to her ??? this is just so weird .. even weirder that she stays with him after that … I talked to a few friends and they do find it creepy of the guy… I never made her feel bad or guilty for it intentionally, maybe I did when I was expressing to her how I feel. As far as I’m concerned, she has been faithful and trustworthy. If not, she wouldn’t have told me about it
I’m bothered that how can she stay with a weird guy like this? How did she not feel violated? especially after just a month and half … he didn’t come from a “low life” place, she told me that his family is living a good life and the guy himself was very popular and social, also a jock.

She never thought he was a creep or a freak, is this normal?
In my head it’s the creepiest thing a guy can do.. how can she still find him nice???
are there guys like that at 15 years old?
is that a common thing to do at this age? Or even normal at that age?
Am I ever going to get over this?

I don’t want to end it with her now because we’re planning to meet by January so we can know how we feel about each other – I confessed things to her that she isn’t happy about either - Sorry if this is too long, but I hope you all can help me and answer my questions, I need it badly.. this issue often gave me suicidal thoughts, made me wonder what is it like to just end these continuous thoughts, if I see a cliff, my thoughts encourage me to “just jump”… if you have stories to share with me about an incident like that please share with me, maybe I can get a different perspective. Men can be very creepy as they get older, but at 15, there are kids like that? specially if they come from a good background