I had the same problem.
Unfortunately, my girlfriend broke up with me and went straight to another guy for support.
I thought that she was cheating on me, and she never bothered to prove me wrong.
She didn't want a druggy as a father, and she left me.
I started talking shit about her to my friends, and to hers as well and made many of them hate her.
I recently found out the truth, and that she had a miscarriage.
6 months living a lie.