So this guy I met on OkCupid and went on a couple dates with seems to be...fixating on me and I'm not sure how to handle it.

The dates were not great, we had no chemistry, and I told him that I didn't want to keep seeing each other at the end of the second date. He handled it ok, but it was really awkward because he asked if I still wanted to hang out and I felt really put on the spot, so I said ok, even though I have no real interest in being friends with him. I just couldn't say "no" to his face. He keeps texting me and visiting my OKC profile regularly. The other day I saw him down the street from my house (he knows where I live because he walked me home on our second date). It may have just been a coincidence, but it was odd, since he doesn't live in my neighbourhood. He hasn't texted in a while, but now he's sent me a message online that says "How have things been lately on OKC for you?" - which struck me as inappropriate. We're not friends, and my dating life is really none of his business. I can't really put my finger on why, but it felt passive-aggressive.

So I'm not really sure the best way to handle this. I'm starting to feel uncomfortable and I'd really like him to leave me alone, but I don't know if I'm just overreacting. I don't want to make a mountain out of a molehill, so I'm wondering if I should just ignore him and hope he goes away? Or should I be more direct?

ETA: So, I sent him a message that said I am not comfortable being friends and asked him to stop contacting me on OKC and through text. If he ignores my clearly-stated boundaries, it's Block City.