Not seeing a mistake here, unless I'm missing something. You went out, looked good, smiled/acted happy, got compliments, socialized...etc. Sounds like all good stuff. Keep it up!
There's going to be uncomfortable situations at times and moments you feel down afterwards, but just "fake it till you make it".
I'd keep going out and socializing...just tell your buddy not to bail on you again.
Me:39 Ex-W:37 M:7 T: 9 S:6 D:3 BD/IHS/Confirm EA/PA: Feb '20 OM1 affair ends: May '20 W/OM2 & moves out: June-July '20 W files for D: Jul20 OM2 confirmed: 9/2020 Divorced: May '21