Is it a good idea to see your ex when you are dating someone else? I mean as friends, nothing more... What do you do if your ex makes a move on you?
You need to think about the relationship that you're in now. If your current BF is OK with it, then that's cool. But most guys would not be cool with that. When I was dating my wife she was still seeing a past BF, but she wasn't honest about the nature of their past relationship. She'd lead me to believe they were "just friends" but there was more to the story. I felt betrayed and it almost ended the relationship. And it pops up as a trust issue even 15 years later. What reason do you have for hanging out with a past BF? And even if your intentions are noble and honest, we guys know his probably are not.