There 2 girls always with my boyfriend and he seen one naked and 1 he banged before we dated but then he became best friends with the one he saw naked and other person in school told me that he saw him kissing with the one that he banged and I don't know if to believe that person I need help please don't know what to do 😭 how do you know a guy cheating on you or don't like you and only stays with you for sex because each time we see each other we have sex we talk and we leave yes there is beautiful moments but also bads we have 1 year and 6 months I need advice what do I do?😢