Fate vs. Regret

Thinking about my Senior Philosophy paper the idea of fate or the saying "everything happens for a reason" came to mind. Along with this I always seem to think of regret. If things really do happen for a reason, then why do some have regrets? Faith plays a role in this thinking because it seems that most people who do have a strong faith seem to believe in fate, whereas those that aren't as intumescent in their faith seem to regret certain situations, like of they just said something differently or encountered a situation a minute later that things would be tremendously different.