Boy trouble

So I’m in a relationship and I finally came out to my school this year ;some liked it overs didnt but in my 4th hour I have some really close friends in there . This dude that sits right by me , I’ve known him for years and when I used to be bi we were fuck buddies . The other night he FaceTimed me I asked for nudes and asked if we could be duck buddies again and I said no I don’t like you like that . ( but what if I do ). He always grabs my hand and holds it and hugs me and touch’s my face and stuff like that . He has a gf and they’ve been dating for a week and he’s already in love . In class he always grabs my phone and stuff and vids and pic of my gf and I are on there and he thinks its hot so he send some to himself and watched them . Last night he asked for nudes and I being stupid I sent them and I gave him a window to ask me for them and I mean my gf actually wants me to have sex with guys a lot ( I don’t know why ) this guys gf is like acting like she knows something but i don’t know . What should I do ? HELP!