mirima

i wish I knew something to make it better

That's a tough situation, but if you know yourself and your habits, that's a good first step. If you know that being in said "committed" relationship isn't something you can do, or do right now, then you can't really, in a sense, be with her. Basically if you care about this girl and you want to have her in your life, in whatever way, then it would significantly better not to hurt her.

This isn't to suggest you aren't capable, but if it's not in your nature, it will cause it's on issues because it's changing who you are to suit this situation. In the end, being honest and straight forward with her, as banal and simple as the sounds, is the easiest way to broach this subject with her.

I hope you can find what will both work best for you and make you happy.

Cheers.