This is my own personal opinion only. What I am about to share is for the person without major mental health issues; without having undergone something really traumatic.

I think when a man says he has "commitment" issues (or when a woman says it for him) -- or when a woman says the same thing about herself -- it's really more "want to have my cake and eat it too".

In other words, where is the need to commit, when it is possible to run off whenever it suits the person?

What is it you truly want for yourself? Marriage? A commitment as serious as marriage (since I know nowadays many people don't feel the need for a piece of paper)? That kind of relationship does not have room for running off whenever it suits.

So. You can lay it on the line, and suggest couples' counseling to help the two of you explore the true nature of your relationship and where you go from here.

Or. You can try doing it yourselves, although I think a professional would be very helpful.

Or. You can continue to put up with what is really not very respectful behavior.

Bottom line: I think there are a lot of people out there who have figured out how to have exactly what they want--at the expense of others. And in your case, you're the one paying.

I hope this helps.