I just found out that when my boyfriend and I dated for the first time he had feelings for and confessed to someone else what do I do?

i am just now finding out about this and when i asked him about it he told me it's not true but i have proof of it. but since it was the first tile we dated and a few years ago (2019) do i let it go? i don't know what to do i'm just hurt...
get over it
leave
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he did it while we were together guys
I just found out that when my boyfriend and I dated for the first time he had feelings for and confessed to someone else what do I do?
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