Relationships

Caught boyfriend in bed with another woman. Why doesn’t she want him to leave to be with her, or why won’t he leave me to be with her?

My b/f and I have been together for 15 years now, while we are not married or live together we do have a 13 year old son together, I do have keys to the house and do everything married couple do even paying bills we just don’t live under the same roof mostly due to him owning his home and I owning mine and neither willing to give up there homes. Well that’s what I thought I have now found out that his been cheating on me for 12 years now She has always known about me and encouraged my B/F to stay committed to me even after I walked in on them in bed together which is when the affair was exposed.
What would motivate a woman to be a mistress yet be happy to never be anything more and encourages him to stay in a relationship with their significant other?
Why wouldn’t he leave if he claim to love both his mistress and significant other?
Is it better to stay friends or walk away completely after finding out what he had done?

Caught boyfriend in bed with another woman. Why doesn’t she want him to leave to be with her, or why won’t he leave me to be with her?
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