There is a guy who had a huge crush on me (i’ve rejected him in the past though) that is hooking up with someone else (exclusively--not on his terms), but gets jealous when I talk to other guys (i. e. whenever i talk to another guy he will always come up and stand right by me, he stares at me a lot, he gets jealous when i go on dates with other guys). Does this mean he has feelings for me? I like him a lot, but he is hooking up with someone else. He did find out that I was interested in him too, but this was only after he started hooking up with the other girl. What does this mean and what should I do?