Ever since a breakup almost 2 years ago a part of me feels dead inside.

Like, I can't care about people anymore. I mean, I have tried but it doesn't feel the same anymore. I can say I love a person, and then feel fine two days later after we break up. I cannot form longlasting bonds with people anymore (this isn't just limited to romantic interests) and people seem to drift in and out of my life, and I don't care.

I know that isn't how it should be. I tried telling my best friend how I felt, and it upset her and she took it to mean that I had lied to her about caring about her throughout our entire friendship. Then she left and I haven't heard from her since.

This feeling of deadness, blankness, a wall if you will, feels like something that has become a part of my personality. It's not offensive, more defensive. Maybe it's neither offensive or defensive, it just is.

Could anyone offer me any insight into this?