How would I know if he lied about finding my body amazing etc?

He never complimented me to start with he said out of jealously of other people wanting me (completely believe this he went mental that someone messaged me when I had never spoken to them before)

He also was into bigger girls and I’m not that and he said irs all he could get and he preferred what I had

He’d always be super into the sex and once we got established and he stopped being so jealous he’d compliment me saying my body was amazing etc and said he forgot how good looking I was if he didn’t see me for a few days

He would say I was a 9 and super hot and he couldn’t stop himself with me. But in arguments would say there’s better than me.

But then he left me for someone else so how do I know if he was lying or not?

I seen messages from him his friend saying (me) looked too good tonight and talking about my bum

He also told his friends he forgets how good looking I am and he hates it when he’s mad at me.
He was lying
He did think I was really good
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How would I know if he lied about finding my body amazing etc?
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