That's how I interpret it. The wording of it is just confusing.

When some people say "dating" they could mean they were going on dates but still not officially in a relationship, so it could be that OP was introduced to a girl her now-bf was also dating at the same time, whilst not actually being exclusive with either of them. That was how I read it, although admittedly I might be thinking too optimistically.

Nudge nudge wink wink.

Because of love and nativity that the person can change

I might get thumbed down for this but I don't always think cheating should result in a break up. My ex boyfriends dad cheated on his mom and came clean. They were separated for a while and went to counseling and now they're back together and happier as ever and go on vacations very often just the two of them. "Once a cheater, always a cheater" isn't always true. Everyone makes mistakes and if the person comes clean and doesn't do it again and works to better themselves, I don't blame their partner for wanting to work it out.

There's an awesome TED talk about this by Esther Perel "Rethinking infidelity ... a talk for anyone who has ever loved". Definitely worth watching. And I agree with #12's controversial comment, while cheating should not be condoned, encouraged or the seriousness underplayed, calling for an immediate breakup might not be the best solution for every relationship.

Really good sex? I dunno, I got nothing.

#12. I'd have a better time forgiving if I was told right away, rather then finding out a month later. from someone else.

I don't completely disagree with you.. But one thing is forgiving your husband and father of your children with whom you have shared a life, and another very different is forgiving a boyfriend. There are many other men who would be a much better partner, so no one should settle for a cheater.