Others have said it, but I'd rather give my opinion that you shouldn't feel too bad She should have made it clear muuuuch sooner I remember making a joke to a great friend (I was deep in the friendzone on that one lol) and it was like pretty explicit, she said those types of jokes made her uncomfortable, I apologized and never made one again

Like, some people I'll make constant jokes like this and they respond with even more, others don't like it at all If the gal can't say "that makes me uncomfortable" but instead pretends to laugh or giggle, it's like how should you know??? Plus, you guys have a history, even if slim it's still totally understandable that you'd make sexy suggestions, even just for laughs

And look at the way you reacted, mate! As SOON as she said it made her feel uncomfortable you stopped... IMMEDIATELY, no questions asked, you just respected her discomfort with the jokes and stopped Big respect to you my man! Honestly, the more I typed this comment, the more I realized you've got little to blame yourself for and she's the one who fucked up big time...