Hi Renee,
I think your making the right decision to keep your marriage together until your kids graduate....that is the only reason I'm still married. The High School/Teen years can be tough enough with out adding the divorce of two parents into the mix. Kids are smart, mine realizes that both his parents don't get along, I told him these things happen but you have two parents that love you very much and care about you...and that's what matters.
Good luck!
Regina