If an ex contacts you to "apologize"?

My ex and I were together for 5 years. He became a drug addict and cheated on me. He did a lot of terrible things to me. When we split up he wouldn't leave me alone. For the past 5 months I hadn't heard anything from him.. then out of the blue he texted me... to say he's sorry and to be nice. I made it clear that I don't want to have contact with him. He said he just wants to be nice and if I want to talk or need anything I should contact him. Why? I feel like he's just using this as an excuse to talk to me so he can try to get back in my life. Am I wrong?
If an ex contacts you to "apologize"?
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