Damn, I'm sorry, but no matter how messed up your life is, is not right to toy with someone else feelings, if you don't plan on continuing with a relationship for wherever reason, the best you can do is tell them.
Your mental distress is no excuse for hurting other people, if you feel emotional uncappable of conect with someone else emotionally, then simply don't do it, and seek help.
Damn, I'm sorry, but no matter how messed up your life is, is not right to toy with someone else feelings, if you don't plan on continuing with a relationship for wherever reason, the best you can do is tell them.
Your mental distress is no excuse for hurting other people, if you feel emotional uncappable of conect with someone else emotionally, then simply don't do it, and seek help.