Girls, if a guy confessed while having a boyfriend, what would you do?

Girls, if a dude confessed his love for y’all while have bfs, but y’all used to like the guy before so he’s a old crush but in the meanwhile you got in a relationship with someone else (which is the now boyfriend) what would you be your thoughts for you old crush that has confessed to just now. ) I’m in this situation rn and I know I should have act sooner…..), this gal used to like me but now there’s someone else in the picture.. that’s so irriting wish I could back in time…. but I loved this girl before the new dude and i know her better than him im not saying she should leave him for me but I want some females perspective on this.
Girls, if a guy confessed while having a boyfriend, what would you do?
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