How can I get rid of this weird old guy but stay friends with my pianist he

[dragonfly]

introduced me to? I really need help! I was playing a violin concert for an old person's center and when I was done this weird guy came up to me and said that he could get me a pianist. I was feeling a little weird, since Im only 12 years old. Now me and the girl are friends but I dont know what to do about him. He has really bad breath, smells really bad, sweats like crazy, and I dont even know if he lives anywhere. I did a concert for a resturaunt a few days ago and he wanted me to play all these baby folk songs! Im doing the DeBeriot no. 9 and I really dont want to play these baby songs. Im in all ap classes, and I dont want to waste my time learning 200 folk songs instead of studying or practicing violin. This guy doesn't understand and keeps begging to come over my house and he says that it is rude of me not to let him over my house. He was crying on the phone when I told him this, so I kind of feel sorry for the old guy, but then he said that he wrote a song for me and I got his creative juices flowing. EWWW! So I dont know what to do. He sounds like a gypsy, and even changed his shirt right outside the restauraunt we played at. He doesnt understand that I dont want to work with him anymore since he knows like nothing about music and all the things above and more, but this pianist that I am working with is really nice and a good friend to me. The guy thinks that the pianist isnt ready to do these complicated songs, and that I should play with him and practically dump the girl. But she's my friend, and hes creepy! She thinks that it is so silly that we are doing baby songs, but he is a good person to get concerts. I really dont know what to do! All this practicing of these folk songs is really affecting my school grades and deberiot concerto.

P.S. he also doesn't tell me when he books a concert. He just books it and tells us that we are going to have to play the concert, and that I have to play with him instead of the girl.

I really think this guy is bad news. What do I do?