Do you feel guilty when you ghost people?

This guy i’ve known for years keeps messaging me. It’s never been romantic from my side but I know it has from his. We didn’t speak for like a year and a half or so because i stopped messaging him because he would take banter to a whole different level and wouldn’t take me seriously when i told him to stop.
In that time i was seeing someone who i adored so much but recently split because the LSR was too much for my mental health. it’s really been tough and me and this guy i was friends with just happened to slide in my DMs.

I told him straight away i had just split with someone and was in no place to start dating anyone for a long time and that the only thing i want is a friend. He said he respected that and would be my friend.
But he never truly respected those boundaries as he would continue to flirt with me and make sexual suggestions, claiming they were just a joke. I did just ghost him, but i feel bad because he messages me wishing me happy holidays for every occasion and he remembers to much information about me from years ago.

I guess i’m feeling bad for ignoring someone who takes so much interest and remembers more things about me then almost everyone i know, but i can’t handle his disrespect of my boundaries. Just wondering if anyone else ever feels this way, or if i should be easier on him and ignore his flirtations.
Updates
4 mo
LDR (long distance relationship) not LSR sorry
Do you feel guilty when you ghost people?
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