My boyfriend destroyed our relationship with his drug use. Once the trust is gone, it’s almost certainly never going to come back.
To feel emotions such as anger, resentment, bitterness is perfectly human. If you are not able to talk this through and make sense of it, it can get worse. I take it you are not able to talk to your partner about how you feel…? What exactly are you getting out of the relationship except for providing him the support and care he needs? Are your emotional needs being met?