CHEATING

Okay, reposting because my last one got deleted.

Is informing someone their wife cheated on them ruining a marriage?

Story time: My boyfriend of 2 and a half years now has just recently been trying to rekindle a "friendship" with his ex. His ex used to live in Wyoming with her fiance, and in that time (before my boyfriend and I were together) he would drive down to sleep with her while her fiance was out of town. That made me very weary about him reaching out to her but the worst part is he changed her name in his phone to "Max", called and talked to her for 45 mins at a time, and has been snapchatting her.

I messaged her husband because i caught my boyfriend in a lie and the husband said he had known they have been trying to be friends. But i felt like he deserved to know that she had cheated on him with my boyfriend in the past.

I told him everything and now i am being told I am trying to tear apart a marriage. But I feel like if you are going to CHEAT you are tearing that down from the start.

What are your views on this??

** It got deleted previously because i posted as anonymous, I was not able to read the responses before then **