You want a serious answer? You're on heroin right now. Not literally, but the throes of passion have a virtually equivalent impact upon the reward centers of the brain. We all experience this, but some of us (like with heroin) are more prone to getting hooked than others. Add that to the malaise your marriage is in and this new "fix" is an obviously attractive option. Except it's not.
Her marriage has fallen apart (and whatever she tells you as to why is only her very early version which lacks the perspective of time as well as an other-side-of-the-story version), and she's got two kids thrown in for good measure, which means that even when her divorce is "finalized" it's not really over as she'll need to co-parent with the ex. That means too, that if you end up living with/marrying her, you'll be effectively co-parenting with her ex as well, and now for the first time with kids in your household who are themselves going through the anxiety/sorrow/anger/depression of a divorce. It's a package deal, unless you just want to sleep with her indefinitely in which case that'll get old in a hurry for her and you'll get pressure from her to get permanent. Suddenly that best-sex-ever is going to be more like I-have-to-hang-out-with-her-and-pretend-interest-in-her-kids-to-get-some-best-sex-ever, and make no mistake, her kids will be her priority always.
The short version is that it's overwhelmingly likely that this won't end well with your college flame. Congrats, you satisfied your curiosity about her but from here on out reality is going to set in.
None of this even touches upon your relationship and responsibilities to your wife. People are saying "man up and divorce her"; I'd say man up and improve your marriage so that a woman with miles of baggage and emotional turmoil doesn't look like a viable emotional and sexual outlet to you at the drop of a hat.