I just started this book and I love it so much I'm going to reccomend it to you: Women Who Love Too Much.
It addresses those kinds of relationships and helps you identify why some women (like me!) need acceptance from someone so frantically and yet their own acceptance of themselves never occurs to them.
You may find it helpful! I certainly do!
ME: 38 BF: 40 T: 10y, no kids, no M (by choice) BD: 7/14/14, BF admits to PA, wants out, lies about new R. 10/1/14: I move out, BF lies about move in with OW 12/4/14: OW confronted, reveals all the lies