Is she a tramp or a nympho?

I recently got involved with the wife of a colleague. I was in the middle of leaving my wife when we became involved. Anyway - things got pretty serious - or so I thought. I fell madly in love with her. But she said she wouldn't leave until her kids are older (they are 13 and 16!). Early on I found out that she had an affair with his best friend for 8 years - he moved away the year before and it ended. Anyway - she wouldn't leave her hubby for him or me. I moved back with my wife for financial reasons - we have remained platonic. And I recently accepted a position in another city - mostly because I can't keep boffing this woman and working with her hubby. She went to Europe to look after her sister (dying from cancer!). Now I find out she is having an affair with her dying sisters live-in boyfriend. It started when she had to be admitted to the hospital. Anyway - she says she is in love - wants me to wait! for her to figure things out. I have learned my lesson. Is she a slut?