i don’t know what to do.....

i’m so insecure. i feel like shit. i’m 32 weeks pregnant, im huge i’m zitty i’m harrier. my boyfriend of 3 years is constantly around gorgeous women. he goes to school (barber, cosmetology) full time and there’s about 3 guys there there rest are gorgeous girls. not only that but in his classroom the guys in there only talk about how hot the girls are there. the tv is always playing rap music with girls shaking their asses. his snapchat is full of half naked girls (not his choice they are on his recommended but i’m sure he clicks or else why would they be recommended). this day and age there’s so much sexualization and temptation EVERYWHERE. he has broken up with me in the past and actually talked to the girls he’s at school with. whatever.... i just don’t know what to do. i’m seriously considering even ending my relationship because maybe i’m too insecure to be in one. i’m having trust issues. he reassures me and says who cares if there’s attractive girls everywhere you’re the most beautiful to me. or whatever. it just doesn’t even register. i don’t believe him. i don’t know what to do. i’ve never felt like this before