I loved my girlfriend's ex-boyfriend

[Collins1]

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[jamie_n5]

Well you definitely have gotten yourself in a difficult position. You can't really blame your friend for being upset about things. You should just try to be as nice and friendly to him as you can. You most likely will break up with this girl eventually anyway. You may have several relationships before you find the right girl.

[yeehaw]

I've been in a similar situation myself, only that my now ex-boyfriend and my best friend were sworn enemies, they hated each other. It is very hard, I'll give you that. But from experience I would definitely prioritise your friend. It's most likely that you and your girlfriend will split up. If you don't fix things with your friend soon, he may not be there for you when that moment happens. I hope everything goes okay for you.