So he invited me to come over his friends' birthday party.
I thought I was his date he left me as soon as I got there.
There were all complete stranger and I didn't know what to do.
So I said I got to go home but he said I should stay to made some friends.
Then he left me alone lol

So later he paired me with another guy and we got along well.
And suddenly he came to me and was trying to stay with me.
I am not sure he likes me or just jealous of me with another guy

Some people are more casual about party invitations than others, so I don't know if he was being rude or just assumed that you would enjoy meeting new people without any help from him or without him at your side. We don't know how well you knew him in the first place. Why can't you tell him how you feel? 'Gee, that was tough, walking into a place full of people I didn't know and you walking away. I survived but don't want to do that again.'
As for whether he was jealous or not, I would guess not, or you'd know by now, right? He'd have asked you out.