Cheaing Husband

I being marry about 4 years I have a 2 and haft year old baby with my husband I ready had a girl she is 13 years old, it haven't being a nice marriage my pregonase was bad he didn't care much about me just two months ago I stop taking pain pills i was on them for a year i was abusin them, and its hurt on me I told him about it he say ok we can help u with it do I start having thoughts about my passes bad thing I did in life and all what I made my ex boyfriend go true so I text my ex and told him I was sorry for everything I made him go true with me then my husband hear my phone when off with a text back do my husband look in to it the phone bill we both have the same phone bill we can look on line one Day he say why your ex text u at 2:00sm I told him the true he start telling me I'm cheating on him so I was getting mad becouse I know it wasn't true so I look in the phone bill I found out my husband being talking and text for 6 months with some woman I ask himhr start telling me what i was talking sbout so i say whats this he start talking bad about me with my ex I start looking in to it so when I was in the bed with my husband he was text her and she was pregnant st the time he being talking to her, we went to church they go to the same church we do I didn't know her but I work with her husband I saw them my hudband was with me I felt so bad u dont know what to say now. to me and him not getting along and now I think I'm pregnant what do I do ??? I need help what do I do now,