"Self-sabotage" is a concept that has gone out-of-style. But when it recently popped back into my consciousness, I found myself noticing signs of it everywhere.
If you can't seem to find yourself comfortable in a relationship (assuming your partner treats you well), then you might want to take a look at this blog post on Self-Sabotaging:
http://www.monikahoyt.com/how-to-stop-self-sabotage/