So there is this guy "Paul" that I kinda like but the problem is I had a "thing" with his friend "Evan" before and heard that Evan  is telling Paul to not get involved with me and stuff. So we are in a class together and we sit next to each other. He talks to me in class and just kinda messed around with me. He also snapchats me. He has football after school but usually when he is on his way home he will snap me. But I'll snap him back and generally he won't send any selfies. He just sends black screens. I can't tell if he's like flirting with me or if he's just being friendly or what? Any ideas?