A guy saying "oh, fuck me" after he assumed he was rejected?

I have this guy who seems super interested in me. The only issue is that his friends seem to know. And they're goading him on.

He came up to my group of girls and asked if we needed help (for some work). I was too shy to respond, so my group mates ended up saying no. He turned bright red and laughed in an angry (?) way. And said "Oh, fuck me then.." and walked off.

I feel REALLY bad and don't know how to fix it. Honestly I'd rather he contact me privately, than to try and talk to me in front of everyone. Felt like his response was slightly immature, and definitely doesn't come off in a positive way to everyone else who saw.

Should I let him make the move or should I contact him myself?

A guy saying "oh, fuck me" after he assumed he was rejected?
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