Yes, and that might be why I'm not married. ;)
But in any case, I agree with Waring.
Aj
Without genital symptoms, I'd say it's unrelated to anything you did 6 months ago. But get it checked if you keep worrying about it or they don't subside.
I wouldn't feel badly about stepping out on your partner. Welcome to the majority! I just read recently that upwards of 70% of couples have at least one partner who has played around. Infidelity is now the norm in marriages, not the exception.