Was he jealouse that I was talking to another guy?

I got mad at a friend of mine, we will call him Sam, something he did to me. So all that day I ignored him and he tried to talk to me for a while but just ignored him. I was so upset that I sat in a different area than everyone and I put my head down and another friend came by to talk to me I will call him Joe, He asked me what was wrong and I told him everything, him he agreed with me and sympathized with me. I cried and he said do not let this guy get to you. As Joe was talking to me I notice the Sam was constantly looking watching us talk. Next thing I notice Young lady came by and got into our conversation which happens to be Sam's little sister and she stayed when Joe seen her coming he changed the subject and talked about the old times when we were in College. The little sister stayed to hear that. I watch the little sister go back and talk to Sam. Yes, Me and Sam like each other. Just a crush!