I just returned from an amazing trip to London where I hosted an event called The Big Conversation (click here to read a review). After my presentation, I had an interesting conversation with a young woman who questioned why she continually got into “bad relationships.” From our brief conversation, I was able to identify several bad habits possessed by men she dated, which ultimately thwarted the relationship.  
I recommend one of my favorite books on the topic of interpersonal behavior — a category that applies to both platonic and romantic relationships. It’s called “What Got You Here Won’t Get You There” by Marshall Goldsmith. In the book, he describes 20 unhealthy behaviors which I suggest you be able to identify in order to fairly evaluate the potential of your relationship.