All relationships, even unhealthy ones, form bonds between people and those bonds are not easilly broken. Every relationship I've ever ended, even the ones that really needed to end, have caused me immense amounts of pain and an immediate instinct to want it back. Just try to keep your perspective and remind yourself that it is normal for your body to want equilibrium, for things to be "normal", and breaking a bond is emotionally (and sometimes even physically) *pain*-full. But, that doesn't mean it isn't a healthy thing to sever the chord. Try to wait a few weeks before making any rash decisions. Make lists of pros and cons, make an effort to socialize and/or meet new people, and try to move beyond the initial sting before you make a decision that you may regret.