He has a girlfriend, but flirts with me via text messages, asks me for nudes,... What does he want from me?

We are both in relationships, but somehow there’s this strong attraction to each other between us and we’re texting each other since 8 years now.
He flirts with me, ever since asks me for nudes and now I’ve sent them to him ( after we finally met together with friends 8 years later, I didn’t do that before) and we started sexting and he asked me, if I would break up with my boyfriend, if he breaks up with his girlfriend or what I would do if he didn’t have a girlfriend and always asks very interested, detailed questions about my life (my family, future plans, my health, my relationship).
He also acts as if he wanted me to leave my boyfriend, but he never says something directly to me like what he wants from me or what he would want me to do. He wanted to meet me several times and when we first started to get in contact, he was single, but unfortunately I was too shy to meet him whenever he asked, then because we didn’t stop our contact and our inappropriate texting while both in a relationship, I broke up with my last boyfriend, because of my behavior.
But now I do it again in my new relationship and he still does it too. He says he wants to meet when we’re both single, but I don’t want to wait another maybe 7 years till he ends his relationship.
What does he want from me? Does he want to check if I’m better than his girlfriend and then leave her for me and be in a relationship? Or what does he want from me- just playing games? Or does he never want to leave his girlfriend and only wants to flirt with me and wants nudes? And WHY would a guy want that?
He has a girlfriend, but flirts with me via text messages, asks me for nudes,... What does he want from me?
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