Op you didn’t live a lie. You lived your truth. He lived a lie - he’s a low quality man who says one thing yet meant another. There is nothing wrong with opting not to be monogamous but it’s not right to pretend you are when you clearly are not. He has a but in his wedding vows - I’m faithful but not if my partner won’t find out. I’m faithful but but if I’m feeling low and sex is on offer. I’m faithful but not if a woman throws ego kibbles at me. He lied to himself first. His word is meaningless.
I believe it’s due to character defects the cheater has. These will have always been present, examples are He needs ego kibbles, he can’t self soothe, he’s selfish, lacks integrity, dishonest, impulsive, low self esteem, poor communication skills, people pleaser, needs external validation. etc etc.
As a serial cheat until he fixes the issues he has he will never be happy. If he isn’t happy with himself he isn’t marriage or relationship material.
So it’s unlikely his relationship is going to be great because he is unlikely to fix his issues.
So write down your values. Then live every day by those values. Keep an evening journal linked to 3 small things that made you happy - be very specific. Not nice coffee with friend but Sat at Laura’s and had a coffee in a cat mug, chatted about x. Laughed at y.
Then run through the values and write how you incorporated them today. Look back on the journal over time and you can see the person you are. Be proud of that women.
You are not a fool for trusting someone and taking them at their word. You need to explore why you think that. Trusting and believing are normal behaviour. Saying you are monogamous and then skulking and creeping around with other women in the shadows is not normal behaviour. It’s grim and sly. Hiding behind the bike sheds with someone else’s boyfriend wasn’t a good look aged 15 never mind as an adult. But he obviously likes that.
Also read ‘love yourself like your life depends on it’ by Kamil Ravikant. Also ‘cheating in a nutshell’.
Look after yourself. Exercise daily, eat healthily, avoid alcohol. Focus on yourself. Write a long list of little and big things you enjoy. Do one of them while the kids are away. Dress nice, do your hair nice especially if you are doing drop off and pick up. Be proud of you. Love yourself. You are the prize here.
Cheats cheat due to their poor character traits. You can’t make someone cheat, it’s their choice. It had nothing to do with you. If you do X I had no choice but to cheat - makes no sense. An unhappy person has three choices a) confront you and maybe book counselling b) put up with their unhappiness c) divorce papers. All three options are fine and don’t damage THEIR character.
I don’t cheat for ME. I want my word and vows to mean something to ME. I said being loyal and faithful was important to me. I said vows in front of family and friends. I’m not faithful because of my husband (that would allow me to have excuses when he annoys me) I’m faithful for ME. He is the collateral damage to my choices.