I'm thinking of my friend's fiance making advances on me on our way to her birthday party.
Did her advances make you uncomfortable?
yes but I'm not sexually attracted to women.
Of course it was wrong on your friend's fiance's part to hit on you. It will hurt your friend a lot. I hope she didn't mean to do so.
Relax, she's committing a crime but I'm not.
It sounds like you may have misinterpreted her advances as just general cheerfulness. This can sometimes happen when we are too focused on ourselves or looking too deep into a situation. As long as nothing occurred, then I see no harm in it.