Why hold on? To someone that don't love you no more. Don't let your religion dictate your rules. And we know. Many loves to do that too.
Why look foolish? To those that knows you deserve better. Holding on to anyone that seeks another. Means if pushed. You be willing to be a part-time lover. Things happens.
It's life. We must accept and adapt to consequences before us.. Stay strong. Stay positive. That something better will come along. Only if they see past hurt has gone.
If misery loves company. Then it knows your address. Just confess things happens. And let the fool move on.