Just out of a relationship, feeling wierd.?

Just ended a 3 year relationship which was mentally and emotionally abusive for me. The girl I dated was unstable, she was very giving and did a lot for me but was also unstable and unpredictable, I called the police on 5 separate occasions because of her outburts. Now that it is over, I feel a bit empty because of the comfort zone, but at the same time we tried many times to get back together in the past, but after a couple of weeks, the posessiveness and jealousy would start again and the vicious cycle continued. Is it normal to feel this way right after?? I think I am doing the right thing, it just couldn't work, she is too unstable, and doesn't reson, and doesn't get my sense of humour (witty) mentally we have always been on different wavlenghts....I feel kind of zoned out, lost, kind of like in limbo...is this because I got so used to the relationship?? Even though it was bad emotionally? Sometimes if you are used to something enough even if it is bad, I guess you feel lost?