Why can't I move on ? What's wrong with me ?

My BF is clearly no good for me. I know he doesn't deserve the love I show him on a daily basis but I love him down to his dirty draws. All I want is him and nobody else. I keep wondering what's wrong with me that I can't have sense enough to leave my BF, let go and move on to someone else that will put me first and treat me a lot better. We've talked and I keep hoping he'll care enough to do right by me but he doesn't. Instead we both hold on and I listen to his lies as he wastes my time. 
  
Meanwhile, other guys have been messaging me and I've been messaging them back with hopes I'll find somebody better. The common sense side of me says to leave my BF alone and explore my options.. But I can't because it's so hard and it hurts so bad to imagine life without him. When I leave, I only want to be with him. I feel so attached to him. But I know I need to leave him alone.         
How do I get him out of my system for good so I can finally leave and move on? It's holding me back from life. 

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