re: EX's BFF still brings her dog to play with my dog; is this a signal?

Are you serious? Couples have issues and arguments all the time, married or not, and still don't cheat on one another. So she gets mad finds another bf and fricks him. Dude i doubt she just made that hookup. Most likely been fricking him behind your back for months already. Let her move in with parents or the new bf. Then you move on and find someone else.