i’m literally crazy and insecure

y’all. idk what to do. so i’m in a 3 year relationship and we have had some rough patches w him following insta models and watching porn and stuff i’m just uncomfortable with. anyways, his friends recently got in a relationship with this girl who is drop dead gorgeous. just so naturally pretty and has a nice body. he went on a trip with them (i wasn’t allowed to go bc i’m 17), and they were all in a hot tub. he also heard this girl and his friend fucking in the shower and he told me all of her kinks and weird shit she’s into. he knows oddly specific details about her and her life and i am so uncomfortable. i feel like he likes her or at least finds her attractive and it drives me crazy. i asked him to not go on the trip (as i was uncomfortable with it) and we could just hang out and he still went. i don’t want to be controlling but i feel so disrespected. i feel like i’m insane. he made me block a close guy friend (who is in a serious relationship) because he’s friendly with me. yet when i asked him to leave this groupchat regarding the trip he wouldn’t because they’re planning another trip i can’t go on. i’m just so insecure about everything and i feel like if he even mentions a girl i think he likes her. also, his friend and this girl got a cat together and when we passed their apartment he said “i miss cookie” (the cats name). y’all i almost knocked his lights out. please help 😩