Good morning everyone!

I am new to the psych central community. I have an urging question that I need some feedback on. Anything helps! Here's my situation:

My partner and I have been together for a little over 2 and half years now.A couple of months into it, I couldn't help but realize that my partner and I had somewhat different views on sexuality. From the very beginning we both established that we wanted a monogamous relationship and that's what we both believed in, but reading between the lines of some comments he's said during conversations, I began thinking that maybe he truly doesn't believe in sticking to one sexual partner. I feel like since then, I've become pretty insecure. I don't like the fact that the partner that i want to spend the rest of my life with, wants to have casual sex with other people. I dont believe there is anything wrong with wanting to do that, but I just don't feel like it's something that I am developed enough to handle in a relationship at the moment. Well, bottom line is we had a huge argument this weekend and all the cats came out of the bag. We talked about why I've been feeling insecure and this subject came up. He finally admitted to me that he feels confused about what he wants. He says he wishes he could stick to monogamy but he gets sexual thoughts about other people. According to him, he has been faithful our entire relationship but obviously, it has been something really difficult for him. We were very open with our discussion and I asked what would be a midpoint for us to meet on the subject. He wants me to stop being insecure and ignore the fact that he gets these thoughts. I find it somewhat absurd to believe that will be the solution to this problem we are facing. I love him to the moon and back but I feel imbalanced. I'm sure my insecurities have only made the problem worse, but I'm wondering if ignoring the fact that he gets these thoughts will actually help. I understand we are all human and sexuality is part of all of us. We are entitled to have our own private thoughts but my questions are: Do I have something that is worth freaking out about? Is it okay for him to be having these sexual thoughts about other people? Or is he raising a big red flag letting me know that the next step is him acting on these thoughts?