I struggle badly with regrets, if I stay focused on them I can cry for days. For me I have to work on forgiving myself, moving on and knowing it wasn't meant to be or it would have worked out. One day at a time!! I truly think regret fades away but it is always lurking in the back of your mind as "what ifs"

I cope by not dwelling on it and finding other things to think about! like today, the present and the future.