My marriage has been falling apart since the beginning.

I’m 22 and will be 23 this month. I’ve been married to my husband since I was 19 and known him since I was 15. Before we got married everything was like a fairytale. And THEN OUT OF NO WHERE two months after we get married he starts staying gone all night “helping friends” not coming home until early morning hours. And then I get THE message. “just letting you know your husband got my sister pregnant” my whole world came crashing down right in front of me. What do you mean??? Did she mean to send that to me? Surely not, my husband loves me. He would never do that to me. - those are the thoughts that ran threw my mind. Of course I ask for some kind of proof in which I received text messages proving that they had sexual intercourse. I felt like dying. I never seen this coming EVER. I wanted to die. He said he was under the influence of a lot of different things and didn’t even remember LOLOLOLOLLOLLLOLLOLL. I was humiliated and hurt so bad. BUT “I” still wanted to make it work because MARRIAGE is supposed to be FOREVER. So we went to our pastor and he helped tremendously. Fast forward 3 years and the baby is NOT HIS BUT he is STILL hurting me, not with other females but still lying to me and using drugs and hiding stuff from me. I don’t know what to do anymore. I’ve prayed. I go to church. I try to be a good wife. I’m just never going to be good enough for him to turn his life around and I’m so tired.