HE's HITTING ME UP

There's this guy that's hitting me up and he has a gf he wants to be semi sexual friends? he tells me that he's into me but he's also into his gf? I'm not friends with his gf she's just a stranger but she forsure hates me cause he has already left her for me but i didn't ask him to leave her he just kept on asking what i would do if he went for me. We dated for a week and his ex gf but is currently his gf texted him when we were dating and I guess he missed her so he went back to her. After all of that drama happening his gf used his acc to block me and delete me on everything but he added me. Anyways he's asking if I would give him a second chance is this considered as cheating? he wants me to send pics he doesnt send tho all he sens are his underwear with a boner, he sends hearts, and tells me i'm into you. I told him i'd only give him a 2nd chance if he doesn't break up with his gf? idek what to do. I told him we cannot date but said to him i want to date. And he asks me will you wait? wtf does all this shit mean btw this is in grade 11.