Let it go.

Cut your losses early.  As soon as you can see that a relationship or situation is untenable, let it go.  Let go and walk away.  Do so in the least destructive way you possibly can, but let it go.  If you’ve been able to determine that it’s untenable, staying in it will only make you hateful and bitter. Deciding that it’s untenable may be the harder part, but if that’s clear then let it go.  Walk away from that which kills your spirit and run toward joy.