I think if I were in your position I would try to avoid this woman who you feel is using you. As for your friend, I think I would make my feelings known but respect my friend has currently a different approach and try not to judge her, I would draw a boundary whereby we didn’t discuss this woman and stuck to happier subjects we had in common.

It is a difficult situation however, and you will naturally have strong feelings. I think it’s one of these things you’ve got to hope your friend will eventually see through herself.