My bio dad wished me a Merry Christmas over text and I feel incredibly guilty

He doesn’t have my number, but today when i saw my older sister for the first time in a while she showed me that hes been trying to get in contact with her through text messages for this last little while and she’s been leaving him on read. His latest message was wishing me and my sister a Merry Christmas and just seeing that makes me feel like I am a terrible person for wanting to go no contact but I know I don’t want him to be part of my life again since my mental health has improved ever since we stopped speaking.

I just feel like a terrible person, what if us cutting him off from our lives is an overreaction? When I was 13 we were taken out of his custody and lived with my mom permanently until we reached adulthood, but we would see him every month or two with a mediator present. The way he sees our history together is very different than how we see it and I just can’t take the gaslighting.

When I was 19 we met up for dinner at a restaurant just me and him and I gave him a chance to try out being normal, but he made creepy sexual comments about which suprised me enough to decide it was the last straw. I’m 22 now and we haven’t spoken since, but knowing hes still hoping to have a relationship with us makes me feel guilt to no end.

I don’t know how to stop thinking about it now. What if this makes me a horrible selfish and weak person