Why does my ex show up at my job after ghosting me?

My (34F) ex (32M) keeps showing up at my job. I've asked him to give me space and to not come to where I work.

I work at a popular place with plenty of other locations close by and it bothers me that he feels the need to come specifically to where I work. We briefly entertained getting back together for a time last year (we initially broke up maybe 10+ years ago) and he made strong advances before ghosting me and I think getting back with a different ex. When I initially asked him to stop coming by, he tried some emotionally manipulative tactics related to a family member's illness.

My employer is supportive of me and will ask him to leave if he comes up again. I'm not interested, don't want him back, and want to be left alone. I feel that it's disrespectful that he shows up, especially after I have asked him to give me my space.

What I don't understand is why he feels the need to continue doing this. Is he just being a creep or what?
Why does my ex show up at my job after ghosting me?
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