i get really depressed and insecure when i see a girl that reminds me of a girlfriend or fiance of some guy that ive had strong feelings for.

for example, there was this guy that i had a lot of feelings for, his girlfriend was brunette and looked a certain way (straight, dark brown hair), and whenever i would see a girl that looks like that, it bothers me, even though its another girl. i guess because i keep seeing other people that look like that, but i dont look like that.

and another guy, his girlfriend is blonde and very pretty.
now, every time i see a blonde girl that is very pretty that resembles her, which happens a lot, it deeply bothers me.
even when they are celebrities. it just makes me feel very depressed, because they all remind me of the guy that i cannot have, who does not want me. because he is attracted to someone like that, and i could never compete with that. and of course he is attracted to someone like that, so beautiful, who wouldnt be? its not like someone would actually be attracted to me and not someone like her, i think if someone werent attracted to her but were attracted to me then there would be something wrong with him. i know that these thoughts are not good things to think of, and but i cant get these kinds of thoughts out of my head. these thoughts are really painful, but i cant help it. so every time i see a blonde girl who is cute now, sometimes i just get frozen and a lot of memories come back and it makes me feel very low.

for example today i was reading an online magazine that wrote something about bradley cooper's girlfriend suki waterhouse. she is blonde, and reminded me of the girl that the guy that i want is dating. actually many girlfriends that i read about.. are models and remind me of this girl. and this girl is not even a model.. she is just naturally very pretty. and if the guy that i like, wants somebody like that why would he ever like me?
and its not only celebrities that remind me of them. people every day. this summer, i see other girls walking around. sometimes i see a girl with blonde hair and dark eyebrows (like the girl) and sometimes it makes me stop and think about this. i try to do it without staring. the other day i saw a girl like that, i was entering a building and she walked past me, and instead of going into the building i pretended that i got a phone call and i turned around to see if it looked like her. i dont even know why i do that, that i want to see how much they look alike.

i feel "traumatized" actually by the image of the girl, and whenever i see someone that looks like them or reminds me of them it makes me feel very depressed and insecure about myself.

i dont know how to deal with these kinds of thoughts.