Most Helpful Guy
I would say that 16 months is pretty long. If you've been spending quite a bit of time together during that 16 months you should have developed a pretty good connection by now.
Certainly there are some guys that will cheat just for sex and there's not much you can do about that other than to try to avoid getting involved with them in the first place.
Most guys though I think will only cheat if they are feeling unsatisfied in their relationship. From what you've said I don't see any reason to believe that he's unsatisfied with you. He says he really loves you and is happy with you. Unless you are seeing things in his actions that make you think he's lying to you about being happy, I think you should just trust him and appreciate having someone that is so attached to you.
Is he doing anything to make you think he's unhappy and/or might cheat? Or are you just worrying about it because you know it happens even though you have no real reason to think it's a risk in your relationship?
If it's the second one, I think you should just try to relax and enjoy being in a good relationship rather than making yourself unhappy worrying about something that probably won't happen.
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