My feelings for him have changed...?

we have been together for 3 years,,in the begining i cared for him so much that i tolerated his bad behavior and drinking. Early on in the relationship he did something terrible .he left me in a hotel room while we were out of town to meet another woman ( we werent offically together at the time but still .) my pride was seriously hurt and i felt so disrespected i dont think i have ever really gotten over it. maybe because he rationalized it off saying "we wernt together." ive never felt any sincerity from him regarding that. now its like i wont tolerate anything from him. he is not an affectionate person to begin with. hardly empathetic to ppls feelings. .. we are living together still (cuz of the economy)but have our relationship on hiatus,,,,and i get soooo annoyed at him about everything now...i dont know how to get back to caring for him and not being so damn mad at everything