What Does It Mean When People Stare At You?

I was at this party tonight that my friend was hosting, It was at his house and I, im a guy and I noticed that this other guy at the party was staring at me often, we wind up talking but that was it, he was with his girlfriend, but I noticed that he was starting at me sometimes. this ? why do at others at a party? He had initiated a conversation first talking about . Im not homo tho and he didnt seem either.