Difficult situation

My husband and i have been together for 6 yrs married for 2. We have had our trying times which has caused him to step out on our marriage. Within recent months, we found out that this female who he stepped out with is pregnant. Yes we all have had words (me and her me and him him and her). I didnt come from a broken home so therefore im trying to work thru this with my husband. But this woman is making it hard for me. And im not going to lie even though i trying to forgive my husband its hard for me to forget so i am not always pleasant and not always ready and willing for sex. Am i wrong? I am trying but its extremely hard 😥