Do you know why it happens?

Because you listened to her BS and started looking back at everything from your past, doubting every decision or move you ever made. Never mind that this is in the past and was delt with long ago.

MLCer lives in the past. I told my XH that the past is PAST and i'm looking forward. Don't let her drag you in.

Be a person you would want your best friend to be. Your best friend is: YES, YOURSELF. Be kind to him.