So your relationship with her started 5 years ago and your single for 4 years now?
If she only wants a platonic relationship, then you really need to find another lover.
So I didn't get it, did you start a new relationship?
So you were seeing her while she was married?
I had a relationship with an MPA, but she broke my trust on too many occasions. She was very sweet and affectionate too me, but in the end, I really couldn't trust her
.
Not all MPAs are the same of course, I'm sure it can work out for some.