How do I let go of my child’s father who relapsed on meth?

My sons father is a drug addict, i recently found out he relapsed and is now on meth therefore I had to make a hard decision to leave him. He’s staying at a extended stay and when we talk he doesn't even talk to me the same anymore. He’s extremely distant and cold and whenever we would schedule to hang out with me and our son he bails saying he’s still working and won't be able to hang out which never stopped him before. I don't know if he’s ashamed or just feels like he has no use for me anymore now that i know about his relapse and won't tolerate it but it hurts so bad.. he won't just flat out tell me he doesn't love me anymore or care about me or his son but his actions dont tell me he does either … i feel like i lost him or never truly had him to begin with and it hurts so bad.. i keep reaching out to him to let him know i love him and he can beat his addiction with help and he keeps pulling away. I hate this so much.. how do i get over him or at-least let him go? i keep trying but trying seems to only hurt me in the end

How do I let go of my child’s father who relapsed on meth?
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