That's how you get really close to someone in a relationship... you keep pushing and growing together as a couple. There's always going to be conflict, that's a given. What I'm saying here is don't get stuck with putting up with crap from a woman just because you don't think you can do any better.

If you are sure that the woman you're with really isn't right for you, then either end it, or explain to her that you want the both of you to start dating other people. Who knows, it might actually make your relationship with her even stronger when she sees that you can attract many other women. :)

This keeps the people with excess baggage away, because the only ones who "make it" with you are the ones who you actually choose to have around.
What should I do if a woman tells me that she's only looking for an exclusive relationship, and that she's not interested in being with someone who can't commit to her?

The answer is simple. Tell her that you're looking for a relationship too, and that because you're two different people, and you have no idea if things will work out, you're going to not put any restrictions on her... and she shouldn't do the same to you.