(F/19) I'm in my first long term and sexual relationship with my boyfriend (M/22) and I don't know if Im over thinking everything.

So let me give you the story anout everything began. We have been dating for 6 months and we love each other. He has only been in one other relationship which lasted 5 years which ended 3 years ago. We met in october the first time at my work, but I don't remember him at all. He kept coming back trying to find me for two months, but I was never there. Finally one Monday I was there when he came in, and instantly I was swooning over him because he is extremely attractive. He was blushing from the very moment we made eye contact. We flirted the whole time I served him his food order. We exchanged names. Later the same week we ran into each other in downtown and THEN ran into each other the following Monday at a coffee shop. He then asked me to dinner and I agreed to go. Basically for him, he was in love with me after that night, like no exaggerationa..After that night we kept going on dates and eventually after two months of dating each other exclusively we made it official. He's always been very affectionate, and would always kiss me for long periods of time. And he was very respectful about he fact I've neer done anything sexually. About 4 months of being together i gave him my virginity. I know if might've been too soon, but we literally spent everyday together too, so it seemed longer. Anyways, after having sex for a couple months now, it seems like his everyday affection for me has changed, he doesn't kiss me as much, and it always leads to me and him having sex, which I don't want to happen every time. And sometimes I feel like if I don't have sex with him, he won't give me the affection I want that is non sexual. And I recently bought him a typewriter for his birthday because he's a writer and wanted one. And I've read something he wrote about women during the summer and how he looks at them and just detailing stuff about "he felt a pull at his groin". I mean i confronted him about it and he says "that he is a guy and guys do look. And that he still loves me just as much as he always has and hes not going to chase down a girl to have sex with her, he merely looks. And that I am still the one he wants to be with and loves." And we also still are with each other everyday, and I stay over there at his house most of the time, but I feel very insecure about what he wrote. And I can't help but feel jealous about what he wrote and the insecure feeling by the lack of affection. Everything else is fine besides that. Am I over reacting? Given this is my first relationship since I was 15/16, makes it hard for me to understand how these things work. Also I do have a trust issue with men, because my dad cheated on my mom with SEVERAL women, so that could be a problem? I know I can't control who he looks at, but should I ask him out of respect of me, not to write about other women he sees? And should I talk to him about how it makes me feel about sex and kissing?