Guys, We like each other but he won’t ask me to be his girlfriend?

I like this guy and he likes me but he won’t do anything about it. He won’t ask me to be his girlfriend even when we’ve been on a ton of dates. I asked him about where he wants us to go and all he says is I like you. A guy I know asked me to accompany him to his work party. I said I would go (as friends) and the guy I like got jealous and mad. I don’t know why, especially when he won’t do anything to make us official. If we were officially dating I would 100% decline even if it is a guy friend outing. I don't know anymore, what should I do?
Guys, We like each other but he won’t ask me to be his girlfriend?
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