I have a boyfriend but am I developing feelings for this guy?

I like his personality a lot he's very funny and sweet as well as attractive. I look forward to seeing him every day and I feel we have a lot of sexual tension with each other. We flirt often too. Is this normal or am I starting to develop feelings for him? I notice every little thing he does and every habit he has as well.

I also am starting to get jealous whenever he gets close to other girls and he gets jealous too when I'm speaking privately to my guy friends.
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+1 y
Actually we almost came close to kissing last week, he initiated it but I didn't encourage it so it didn't happen but I admit I wanted to do it and I liked being that close to him
Updates
+1 y
He has a girlfriend too but he's the one who's been initiating everything I don't know what's going on what I'm getting myself into ever since that almost kiss last week. I had been avoiding him after that and he got very upset. He wanted to know why I had been avoiding him but I don't know what to say. He still talks to me and flirts with me every day but I'm very confused about what I should do. He seems even more possessive now and seems totally smitten with me.
I have a boyfriend but am I developing feelings for this guy?
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