Please help!! venting

I recently found I was pregnant and I've been really sure if I was ready for another baby. But tonight proved that fear. My husband and I have been together 7 years out of this seven years we have been married 9 months, we have a 5 year old daughter and I have been just really if about expanding our family, my feeling & women's intuition had just bee telling me that we're not ready. Well now I'm 6 weeks pregnant and contemplating abortion because I just found my "husband" has been sending dirty text messages to some other woman. This isn't the first time I've caught him, and although it breaks my heart to face facts I can't trust him and I don't not want to have another baby with him. I'm dying inside just going through this. I cannot believe that this is happening to me. And right now I feel & see that having a baby would just kill me inside because I don't trust my husband and how can you wanted to have another baby with someone you can't even look at or want to be around. ???