How do you feel about yourself? I think that abandonment issues often point to the fact that one is not comfortable in their own skin. To me, that makes sense. Any time I've felt abandoned by someone, if I really look at the situation, they are the points in my life where I am unhappiest with the person I am.

I think we must first love and accept ourselves before we're able to understand why attachments don't happen or break easily. I'm not saying that this is what is going on with you; I'm certainly no expert.