Most Helpful Girl
I have always tried to stay friends with my ex's but it never works for me, but you two were good friends before and it was a short relationship that just didn't work for you both. I don't see why you have to lose a friendship just because you dated.
I understand why your boyfriend is asking you not to, because he doesn't want to experience you guys finding lost feelings again.
As long as you and your ex never talk about feelings, or the past, I don't see anything wrong with it.
But make sure you make your boyfriend feel like he's a priority over your ex always. And always stay honest with him.
And never talk about your boyfriend to your ex if you're having a problem with your boyfriend.