well he probably won't like you for a while or a long while for doing that. until then, refrain from doing that.
YES! Not only would that offend her but also might her your friend mad at you!
Well boii it depends how good of friends ur if you guys just became friends thaan no! but if you hve been friends for a while theen mayb if you best friends suure...
Time to move on...
just a little
Only in the right context. If you're in a public place, no. But if you're watching a movie with her on the couch, go for it.
If she likes it you're awesome. If she doesn't you are beyond redemption.
Were they dating at the time?
If the answer is "yes", then yes.
If the answer is "no", then no.