Tales of the Ex Part Deux

Let say, my ex & I still in good terms. We still contact each other. As friends, obviously.

But the situation is, I'm already in a serious relationship and he in the other hand is recently single (just divorced).

All this while, my bf seems OK with me befriend with my ex. His reason: I'm happy with you, I trust you. And after all, he's married aight? And I know u will never ever agree to be a 2nd wife.

Fine.

But now, my ex is single again.

So, the question is: If you're my BF, will u still allow me to still keep in touch with this ex? Knowing that, MAYBE I had something to do with his divorce?