Lol well ain't you just the ladykiller? Can't say I've had them problems, but I've seen this scenario paly out a lot. The cheaters, frankly it seems like kind of a game. My good friend whom has stayed with his damsel many years has noticed this too. Basically instead of just breaking up they kinda go tit-for-tat cheating on each other. It's not about them liking you at all, they're just trying to cheat on their lover to get revenge or in some sorta backwards illogic to get them back (I know it don't make logical sense, but this sort of stuff never really does.) Sorta trying to even the score so-to-say, but in reality they both get played and lose in the end.