Can someone who has cheated on past partners change their ways, Why or why not ?

I wish I could say the same. Last relationship I was in we thought we were going to get married. He cheated on me and she knew about me.

Fast forward to present times guy I’ve been talking to cheated on his last partner. I started hooking up with him in March and then started dating him in October. They dated for a year and him and I started dating a few weeks after. I had no idea he was seeing anyone. I check social media and no sign. His IG was private though.