My former friend with benefits keeps texting and flirting with me but he has a girlfriend. Why?

Anonymous
We used to be friends with benefits and now he has a girlfriend I hear that it's serious between them. They might even move in together. Yet, he keeps texting me all the time and when he does, he ocasionally flirts with me.
He doesn't ask me to hang out but keeps texting and emaling me about everything. He talks about his day, his work, he sends me jokes and funny pictures. From time to time he compliments me and says something flirty. Why is he doing it? I won't ask him to hang out because I don't want to get between him and his girlfriend but keeps in touch and uses any excuse to get in touch. Today he texted me at 7 am asking about a song we used to listen to. Why is he doing this? I can't figure him out.
My former friend with benefits keeps texting and flirting with me but he has a girlfriend. Why?
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