I think that if you flip the microscope and look through a telescope it gets easier.
Microscope: the wedding, invites, guests, costs, plans, wasted desserts, honeymoon, giftsetc…
Telescope: in ten or twenty years none of that will matter. Look back from the woman you will become. You can be the woman who married a lying cheater. Or you can be the woman whose self esteem is so high she threw that rotten fish back and continued on her journey.
The woman who marries this man will be miserable from day one. Her trust is broken and her health and her children’s health may be at risk. Her marriage is built on sand. In ten years she is tied down by mire chains: children, mortgages, friends, expectations. But also burdened by regret and anger.
The woman who dumps him? She takes off on the honeymoon with her best mates snd goes on to live her own bold life. Leave a cheater: find a life.
Don’t stick around to become older snd wiser. Wise up and run into a better life now.