i agree with empire king lol, but for me it was when in the middle of our late night conversations he would always say he had to call me back because his aunt from trinidad was calling [at freaking 2:30 in the morning???] then he would call back like an hour later and say she just wanted to "talk" anyway i took this as my 1st sign so i just decided to ask him if he was cheating, and obviously he said no, but he tried so hard to convince me that he wasn't cheating that he was getting angry and i was becoming suspicious even more, but i laid off him for a while, until one day a girl called me from his phone asking for him, i was like umm shouldn't you be with him if you're using his phone, she was like no i'm just holding it for him, i was like who are you anyway she said she was his "girlfriend" and she asked if i was his sister because that's what he told her when she asked about my number in his phone, so i was like f*** no i'm not his sister, and as any typical trini woman, i blew a fuse and cuss this girl out for no reason. My point being that guys are snakes, my ex used to buy me stuff like crazy to keep me quiet and i guess to take his mind off of his guilt? then he would always have something s3xually new to teach me although we never did it, so i was wondering who the hell teaching him all this stuff, and he would keep trying to set up on "girls night out" with all my friends especially on weekends just so he could have some "alone" time,,,yea,,ok.. [he wasn't cheating with 1 girl, to my count it was atleast 4 or 5]but yes i guess if a guy is cheating you would know, because it's not like you won't see changes in his behavior and stuff. Good luck