Gordie, I think it is only hard because the manipulation here is in the form of "niceness" and being desired.

How can she say she didn't like having sex with you and then ask you for sex all the time?

I think if you translated her come-ons into what they really are, cruel attempts to keep the cake shop open, it might be easier to resist them.

Or every time she says it just think about the cruelest thing she has said to you about sex.

I still think she'll come back some day, but I think she needs to spend some time on the outside first.