You can't, and why bother? Does it really matter if they like each other?
They will probably never get along because I suspect each is jealous of the other, and that's okay. They don't have to be friends, you know. Sounds to me like you might be trying to force it. It's normal behavior to want to bring together people that we love, but it doesn't always work out.
You have good relationships with both of them, and that's what matters. I suggest keeping those relationships separate.
Thanks for the question.
I’m with Cary…, don’t worry about it. It’s probably jealousy like he said.
I have friends who don’t get along with my other friends. If I invite them I, I just mention whose coming & it’s up to them if they want to or not.
I'm in the same situation, the hardest part is I want to share what and how I'm feeling with my best friend and I can tell she is not interested in hearing about my relationship :/
It would really suck if you couldn't have them in the same room without them being civil to one another, though... -_- Ugh. That would drive me crazy.
There's something to be said about not mixing friends. They're just not all going to get along with each other. So keep your party group away from your book club chums, etc. In your case, you probs can't prevent occasional run-ins b/t your BF and BFF, so just try some damage control so it's not WWIII every time you socialize. GL!