Name, you seem like a smart woman. You don't jump on the douche bag bandwagon just because the guy has a decision to make which he hasn't had the time or sufficient information to make. I'm 90% sure its all like I described in my other post.
How do I know? I have been there before. When I was 21 I had a LDR. It was just a bit more serious than the guy in your situation. I had been with her for about 4 months and she lived about 3 hours away.
Then I met a friend of a friend who was WAY into me. I didn't know what to do. That's a really hard situation for a guy to be in. A week or so after I met the new girl she tried to get me to cheat (actually asked me) so that settled that. (If cheating WITH her wasn't a big deal she would have done it TO me as well)
The LDR girl is now my ex-wife because she cheated on me lol.
Anyways, if he was just a DB looking for a F*** on the side, I don't think he would have exchanged 900+ texts with you (I think that's how many you said) And definitely not about all the subjects you mentioned, that shows genuine interest. Another thing is if he was trying to have a F*** on the side, he wouldn't be so open telling you about this other woman.
The fact that he said he's not sure about the long distance thing with the other woman just tells me he that he thinks there is a possibility with you, but he also wants to be honest with you. He knows if he lied and said he was 100% available, THEN he would be a douche. Like I said, its a tough situation.
Just from what Ive read here, he sounds like an honest guy.
If I were in his situation, As soon as I got back I would set up a time to meet you. Not a date, but maybe the athletic activity you mentioned. Then i would just be honest. I would say that the long distance thing isn't ideal and that If you wanted to get to know me better I would tell the other woman that the LDR just isn't going to work, which isn't lying to her, but just letting her down easy.
Its been 9 years since I had to make that decision and I have learned to just be honest with people, and I dont think I would have another LDR just because situations like this are bound to arise.
And by the way, someone here said that its easier for a guy to have unemotional sex or someone on the side or whatever. That may be the case for a few uncaring men, but it is definitely NOT the norm.