My ex texted me and then blocked me. Why?

My ex and I have communicated on and off for the past few years and I’m finally tired of being used and invalidated. So, he texted me again after almost a year of not speaking. His text isn’t a “Hi, how are you?” It’s a nude. We’ve never had sex but we have sent pictures before. And I regret it. I truly wish I could undo that mistake but I can’t. It was dumb of me to act that way. So, i’ve excepted that it’s my fault for letting that behavior be ok to begin with. So, I’m not sure if I can be mad about it but I know better now.
I digress, I told him to go bother someone else if there’s another girl that will give him the time of day. He said that there was but then followed up with “ how are you?”. I asked him if he had anything meaningful to talk about he said “yes, how are you.” I said bye because I knew he was messing with me again. And he never responded as a matter fact, now I’m blocked. And it’s left me a little confused?
Out of all the times we’ve talked on and off over the years I have never been the one to initiate contact. I don’t text him regularly or anything so why was I blocked? I’d like to say it doesn’t bother me but it does to a certain degree. I didn’t want to talk to him but I didn’t necessarily expect to be blocked either.

I’d like to think that I can still be friends with people despite whether or not we fell out for whatever reason. I try not to cut people off to that extent. I do care about him but I guess that doesn’t really matter ultimately. Anyway, I’m just wondering why some people do that? Why do the people that reach out to you, block you like you’re the one harassing them?

Thank you for your answers. I appreciate them.
My ex texted me and then blocked me. Why?
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