I accidentally gave a guy my number!!!

Hi ladies,

I was at work two weekends ago (I work at a copy and print center in customer service) and a guy came in asking is to do a job for him. On the side, he quietly offered me a side job and i said I may or may not take it depending on my availability since I only work part time and it's the summer. He asked me for my number and gave me his in case so we can stay in touch if I decided I wanted that job later on.

He texted me yesterday and asked how I was doing, so replied that I was doing well and asked how he was. I didn't think he was going to delve into his personal life or ask me about mine, but today in the morning he sent me a text asking me how life's going, both work and personal. It seems like he's interested to pursue something more than hire me (which I'm not interested in anymore), except I have a boyfriend and this guy is at least 6 years older than me, plus I'm not interested. What should I do? I don't wanna ghost him but I'm not interested in talking to him...

UPDATE:

I texted him that I'm good and I'm grateful for his offer but I won't be taking him up on it, and good luck to him. Hopefully he gets the hint!