If a realtionship already failed once then it's never worthy of a 2nd chance right?

I was in a relationship with my then boyfriend twice. I broke up and blocked him twice. The first time I was 24. I went single and focused on college and other interests. I told him there was no future with him, he was a cheapskate and was full of lies and BS.

I unblocked him and got back with him (he kept insisting to give him a chance, that he changed, was ready to commit, even made me think I was harsh, etc) when I was nearly 30 for the obvious. I wasn't getting back with him because ''Oh I missed you so much, oh remember the good old times, oh the passion''. My stupid self put up with it for a couple more another years.

He didn't think I had the guts to dump him easily like I did before. Suddenly he started acting controlling, as if he had the upperhand. I blocked him and dumped exactly 10 years later since the 1st break-up, at the age of 34 and landing on the very same month. Turns out all the begging and convincing me was a manipulative strategy he did. He wanted revenge for the 1st break-up and turned cruel in the end. I dumped him for the same reason and for being a scammer.

Is giving a 2nd chance to the same guy that failed you once foolish?

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He became worse than the first time. He wasn't just a liar but a scammer too and trying to use my age as a way for me to stay with him, as if saying ''You're too old now, you don't have the guts to dump me''.
If a realtionship already failed once then it's never worthy of a 2nd chance right?
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