Is it okay to punish my cheating husband by getting an abortion?

I just found out that my husband of 2 years has been having an affair with my sister. It's been going on for 6 months and I am furious. I am currently pregnant with our 1st child. I really want to hurt my husband, so I am going to get an abortion since he is pro-life and a practicing catholic, despite his infidelity. It might make him leave me, but I don't care - I just want him to feel the pain that I do. I can always get pregnant again later. Is aborting his child is the best way to get back at my husband or is there something else that might hurt him even more?