Should I message this guy?

Haven’t heard from this guy that I’ve been casually seeing in 5 days. I found a message from another woman ask to meet and I confronted him. He said they went on a few dates last year and now they are just friends who have dinner occasionally. He said I’m the only one he’s sleeping with and he thought it was silly that I would get so upset about it. Then he said he’s sorry that I had to find out like this. Told me that I’m special to him and he really likes spending time with me. Should I believe him?
Should I message this guy?
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