Man from dating app keeps messaging me even though I've indicated I'm not interested
A man contacted me over a dating app last year and we met face to face briefly. He was interested in me but I wasn't interested in anything and indicated as much. It was just a friendly encounter and we chatted for a bit, nothing more. Shortly after he messaged me to say he wouldn't mind keeping in touch online by chatting, or something along those lines. I said I wasn't interested in that and didn't think it was appropriate since I wasn't interested in him. He continued saying hi to me and trying to strike up conversations over the app which I ignored for the most part. That persisted for a bit at which point I got tired of it and removed my profile photo and description and stopped using the app altogether for almost a year.
Fast forward to today I wanted to try again to meet someone so I updated my profile with new photos and text. I thought enough time had passed and he moved on. But I was wrong, I guess he must have seen the changes in my profile and he started up again. I replied once when he asked how I was doing since I'm a nice guy and thought it was harmless. But now he keeps messaging me again like before. Asking me how my weekend was, how I'm doing, how the search goes, just saying hi, etc.
I haven't replied anymore to these messages and don't intend to reply to any in the future. I'm just not sure how else to approach this, short of deleting my profile altogether which I kind of don't want to do.
I find it hard to be rude to people, which probably might be the reason I fell into this trap to begin with. It's just not in my nature, so is there a non rude way to solve this if my silence doesn't work?
I also worry about running into him in day to day activities like grocery shopping as he is from the same area as me. I haven't yet, which is good, but there is always a small chance unfortunately.
Either this guy hasn't had any luck meeting anyone, or is obsessed with me or something.
EDIT: sorry if this post sounds weird to you guys, this isn't a humble brag, or me seeking attention. I honestly don't have too much experience with online interactions like this. As explained in one of my comments I did not block because I view it as reserved for those extreme scenarios like rude, spam, insults etc. which this doesn't really fall into.