I have thought one day, when I'm old, my regrets will be miles long.
In your case, if you decide to leave and move on, will you have regrets? Possibly. If you stay, will you have regrets? Possibly. No matter what decision we make (and indecision is a decision), we can have regrets.
You soul-search, reflect, pray, seek counsel with family, friends, professionals, and make informed decisions. It beats making decisions out of blind emotions (trust me, I learned this one).
Actions speak louder than words. And the pain associated with those actions can hurt more than words. How can someone truly love you, while acting directly opposite of love? It's inconceivable, right?