No-one wants to, but if I may..

Time moves, people move. It is the relentless march of time that means that things can, and do change.

The change provides an opportunity for reflection, even if it is difficult. As painful as this can be, it can then be used to further benefit you.

Nothing can change the past, and we can't go back. All we can do it look forward to here and now, as that is the only place the opportunity to change lies.