What should I do next?

It’s been a year since I got married and my husband had this girl bestie who I know since the starting……

When I met her my intuition screamed that she have feeling for him so I told my husband to not to talk to her anymore for which he agreed…..

He isn’t talking to her as he used to before our marriage

Then recently he blocked her everywhere so she mailed my husband which left me in shivers

The mail: I cannot live without you ….. we used to very good before your wife came into your life. I used to get very angry when you gave her(me) importance …. But I understood the reality and accepted her…. I compromised on lot of things including your baby..(I’m pregnant) I accepted the baby as my own.

And I told my husband that I saw this mail and he is now very sorry for me and telling me that he do not have any sort of feelings for her (which I believe because I have seen how he behaves with her)

I know my husband he is noting sort of that type but she sure is she is a home wrecker and I don’t know what to do next Should I confront her husband or talk to her brother or do what??? (and ohhhhhh she is married for 10 years)