its kinda awkward if your going to talk to your ex's girlfriend/boyfriend.
my ex boyfriend's girlfriend tweeted me on twitter and it's kinda weird coz she asked for my private number. we'll for me there's nothing wrong with that. im not that really affected. but there are things that coming to my mind. like, this girl has a bad intention or she wants to get some information from me about his boyfriend. but when she texted me, she asks a lot of questions about me and his boyfriend. isn't that awkward? well i guess that's part of her, being FRIENDLY. but the only thing i want to see is that. even though you and your boyfriend's ex become friend still there's a little bit tention between the two of you.
usually the ex's are the ones who want to communicate with there ex's current gf/bf.