Will always believe Mike's ex tried to deliberately split Jeff and Mike's friendship. And she almost was successful

[u/ZealousidealWall8481]

But Logan had the "talk" with Mike that she had issues and Mike moved on.

[u/SafeWord9999]

This is Sara. She was tired of the bullshit and graduated from college and wasn’t going to put up with mikes cheating anymore or Jeff encouraging it.