Was he flirting/is he interested? Sorry for the over asked question?

I met a guy yesterday from school while we were doing a fundraiser. He came over to my group and introduced himself, so we did the same. He already know my friend sitting next to me, and sort of knew a few others, and we started talking. Whenever I said anything, he would really stare. (my friend pointed out after how much he was staring, and finding excuses to ask me questions) And when the dj played my favorite song, and my friend pointed it out, he asked me if I could sing. Later in the night, he came over and played cards with me and different group, and brought over a coffee for me after. Is he just being friendly, or is he interested? Sorry for the over asked question.