Input needed about my affiar status

Ok - This one is a doozey!
I'm a widower of two years. She's has a boyfriend of four years. We both work at the same company. Our relationship started in August 2018. Sex began in December. Last week, an unknown co-worker contacted her boyfriend and exposed our relationship. When he confronted her, she confirmed everything. So now, EVERYTHING is out in the open. Note: This the SECOND time that she's cheated on him within 16 months.


So here's where it gets REALLY weird: The boyfriend is willing to try and work things out with her. But she's told him that she still wants me to be a part of her life (as just a friend, of course). Apparently, he's agreed to this!
So....the boyfriend is willing to remain in the relationship with a woman who's cheated on him TWICE, and...he's willing to allow her to maintain a friendship with me (whom she has admitted that she's in love with me).

So she's going to set ground rules that her and I will be "just friends". It'll probably be things like no more sex, romance, touching, etc. She's probably hoping that we'll just talk on the phone as if nothing ever happened.


Additional problem: I am deeply in love with her and want to be with her. (Yeah...I know: I'm stupid)
If I keep her in my life (as "just friends"), the emotion will probably kill me. If I walk away, she'll say that I'm abandoning her and make me the bad guy.


Now what?