My co-worked superliked me on tinder- and now I feel really awkward?

I've been on tinder for a year now, nothing too serious just what everyone else seems to be doing and I'm single what's the harm?

Anyway, I have a new job, and one of the guys there is a few years older than me and has been pestering me a lot and running after me just to talk.

He asked me in front of about 7 other members of staff if I had a boyfriend, really loudly in the room. I stupidly said "Yes" thinking it would make him leave me alone- hasn't seemed to have worked and I felt a bit daft for lying!

However, I've been off for a week and whilst I was on tinder I came across him- he had superliked me! Superlike means I can see that he wants to match with me before I swipe yes or no. I feel really awkward now and I'm back in work tomorrow. I feel a bit uncomfortable with him anyway and I know he will probably say "I thought you had a boyfriend". I was thinking about going to management over it but that would be silly as they would say I'm also on tinder and technically he's done nothing wrong.

What do I say to him? I'm not attracted to him in the slightest and I have absolutely no interest in him!