My boyfriend hasn't *** yet...?

We have been dating for about 2 months. We had after about 2 or 3 weeks of dating. He did not *** the first time and I thought it was because he was nervous, no big deal. After a week of every night he still had not gotten off. I asked him about it and he said its because he is out of shape. So I didn't bug him again about it, but now its been 2 months and still nothing. I think I may be masturbating to much. Its his body so if he wants to get off that way its fine with me but its just getting a bit weird for me... Plus he is waring me out with the marathon , we need to start at 9:30 just to get to sleep before 11:00. What's a good way to bring this up? He is a bit shy when it comes to talking about .