Nah, "baisez mon pote" means "fuck my friend". A proper translation would be "pote de baise", although to be honest I've never heard it in use here — the more common expression is "plan cul", which minimizes the "buddy" part but can obviously cover a lot of nuances.
At least that's what I'm guessing from the TV shows, everyone I know is either in an actual relationship or does not have s*x at all 🤷
My wife and I thought that phase was super weird honestly. It was like suddenly just by mentioning your gf/bf to a stranger you're telling them a really major thing in your life.
Getting angry or complaining about how someone calls their significant other and gatekeeping when it can be used is something they should've learnt to get over a long time ago.
I think fiance, wife, and husband all sound bad. I call my partner my partner, because she's my life partner. Really it's a better description in my opinion. Being a wife or husband means absolutely nothing, especially given most end rather quickly