I feel so guilty after rejecting a guy!

I (F18) was seeing a guy a couple months ago. We went on three dates and although i liked him I felt a very unhealthy relationship developing and sure enough he ended up ghosting me for a couple weeks.

After this he messaged me apologising, which I accepted but we haven't seen eachother since. We maintained small talk over text (mostly because I find it hard to cut people off - I am a huge people pleaser) which was all friendly.

I met a different guy who I have started seeing more seriously recently and I knew I should stop talking to the previous guy as I wanted to take this new relationship further (not official yet) but wanted to find the right time to tell the previous guy that I can't text him anymore.

Today, he randomly invited me to go on a date with him and of course I said it wasn't going to happen as I was seeing someone new. Now I feel terribly guilty for rejecting him and am worried he mistook my maintaining small talk as leading him on! He has left me on read since my rejection. Should I feel bad?