Is it bad I'm tempted to report my ex to immigration

I'm hurt I've recently found out he cheated on me and got someone pregnant. So I want to report him to immigration

He told me his passport has false information on it, he changed the details to get into the country. The passport doesn't have his middle name on it

I'm hurt used and betrayed. I feel like I was just a bank to him, he was always needing to borrow money from me, he made me even more broke because he couldn't pay his rent.

I want revenge, I'm not lying about the passport so it's not like I'm making something up. Is it bad for me to report him.

He also has another child not in this country who he hasn't seen in 10 years. He got rejected from entering the country like 3 times.

I thought I was pregnant once, and he got angry at telling me I better get rid of it.