more often than not when a boyfriend is talking to his ex it means one or more of them still has feelings for each other. And that’s a red flag!
Now Look, I’;m not saying that a person can not break up with an ex-flame and still be friends with them. It can happen. But when you understand the nature of human beings and how we are driven by our emotions my experience has shown me that it is next to impossible for a person to be friends with an ex if one or more of them still has feelings. And herein lies the problem.
Usually one of the two (the guy or the girl) still has feelings for the other so they think by holding on and being friends, one day their former mate will come to their senses and want them back.
It would depend on how much time they spend together and how emotionally attached they are. If I was confident in my relationship and felt it was strong, and if they weren't spending much time together- I'd say its ok. Otherwise why aren't they a couple still?