help, be aware that she may attempt to use sex to reattach you. With her recent past I would be very very leery of giving in. The rule is that if she is not physically cheating then you can as long as you do not have any expectations or attach any significance to it. In your case I would handle this as if she is physically cheating because all signs point to that as being the case.
"Sorry, that is what we would do if we were in a committed relationship with each other. I cannot jeopardize my health on top of everything else."
M(51), W(52),D(16) M-20, T-23 Bomb Drop - Dec.23, 2017 Ring and Piecing since March 2018