I agree with Tori: You need to act in a way that will build her respect for you. This means setting and holding firm to your boundaries.

She'll never respect you (or fall back in love with you) if you don't respect yourself.

Search for some of Sandi2's posts for more on this.

M: A really long time.
Crisis: 5 years.
She's still worth it.

Life is never made unbearable by circumstances, but only by lack of meaning and purpose. -Viktor Frankl