Why does he constantly text when he has a girlfriend.

Back in the summer I met this guy online. He's very confident and good looking and he knows it. We chatted for a few weeks, lots of joking and flirting and I was starting to like him then he said he had recently started dating someone. We met just as friends soon after and have been texting ever since. He's very chatty in his texts. In person he was different, he comes across quite aloof, very little eye contact and a little awkward which was strange I thought but he was also quite funny and easy to talk to. I was quite surprised that he stayed in (text) contact though. We text almost daily usually although sometimes he'll disappear for a week or two but then he comes back and apologizes for disappearing and it resumes again. Sometimes the texts are just chatty other times they're very sexual. He says he doesn't cheat but even though nothing physical has happened and he's not even suggested meeting up again the things he says are pretty inappropriate for a guy who has a girlfriend. I wonder why he does it. Does he just enjoy the attention or is he hoping that I'll be willing to sleep with him should his relationship end, is that why he's always texting? We have a similar sense of humor and chat easily but I'm not sure what's going on. I've never told him I like him or even said he's attractive or anything but he can probably tell anyways.

He's very active online and is always posting photos and leaving very flirty comments on female friend's pics on Facebook. His girlfriend will see that stuff and I wonder what she thinks of it because that kind of thing would drive me crazy. I'm not on his FB but I can see his public photos, including some of him with the girlfriend. He has a lot of female friends (mostly online) but most of them aren't local like I am and live in other states or even overseas so he's unlikely to try to hook up with them but he gets a lot of attention. I'd compare it to being like a rockstar but without the fame and money and I wonder if I'm just the latest member of his fanclub.

I'd be interested to hear from people who know guys like this or even guys who are like this themselves. I'm interested in the psychology behind it. I know that if I had a boyfriend I wouldn't be saying the things he says to me, to anyone else.
Why does he constantly text when he has a girlfriend.
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