Regretting marrying an older man

Hi guys, so i wrote here before about my husband loosing interest in sex. He is older than me like 17 years gap. I already talked to him numerous times but he never changed.

Is it bad to regret marrying him after 9 years being together????? The main reason here is SEX.I am 32’yrs old with a very high intense sex drive and he is 50 with no more drive at all. Should i cheat? Is it worth it? Advise please..