How do I deal with this situation?

I have a friend of mine, a really good and old friend of mine who is jealous of my relationship with a certain girl. She is deaf, which is the reason he turned her down in the first place. However once I got her, he seemed to be a little jealous, now that he has figured out that we have done a little more in the bed. He is seemingly getting aggravated and I'm worried that he might turn hostile. Which obviously I don't want to happen, I can't talk to him without him getting mad or upset. But at the same time if I ignore him he will get mad at me and threaten me and my girlfriend saying that were ignoring him. I don't want to lay hands on him as he is my best friend but I'm not letting him lay hands on me or her either. What do I do to put the whole situation down without a fuss. Or at least what should I do?
How do I deal with this situation?
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