Severe insecurities and bf w/ wandering eyes 💔

I need some advice or something idk. I’ve been really insecure lately about the fact that I’ve caught my bf looking at other girls. I’ve only caught him once or twice but it still bothers me. I tried talking to him about it but he said that I need to talk to a friend about it and stuff since he’s the problem he can’t really make me feel better about it. He said that I’ll never find a man who won’t look at other girls. It’s really eating me up inside and I don’t know what to do. I know he’s a guy and guys do that but it just hurts me a lot. And I already have problems with worrying about him cheating, this doesn’t help my trust issues. Now I won’t be able to trust him to go out in public by himself because all I’ll think about is the fact that he probably looked at girls. I really don’t know what to do and I guess I’m alone on this issue. He said I do it too but in public I look at girls because I’m jealous or comparing myself, I can’t help it. I really don’t look at males. If there’s an attractive male around I fight the urge to look because I want my eyes on only my man. I also feel guilty if I look at someone else like that. I’m sure there’s nothing I can really do, I guess I just needed someone to talk to and if you just had advice it would be nice to listen. My trust issues mostly come from my past and very serious things that happened. I don’t want to be an annoying gf or controlling or anything, I just have bad insecurities and depression and it’s really hard sometimes living with myself. It just doesn’t make it easier knowing that the only person who hasn’t left me also has eyes on other girls. I know I might sound dramatic it’s just a really big issue for me and i needed to talk to someone because I don’t really have friends. If anyone has some advice it would probably be nice to hear.

Thank you, I’m sorry this was so long ❤️