So many here have said it better than I can...but I will put in my 2 cents.
I (like Superfemme and Plato) was married during California's Summer of love. I too rejoice in my marriage, and am saddened for our friends who cannot enjoy the same right.
I was married for 12 years to my daughter's Father, and I struggled with ending our marriage because I feel that marriage is for life. I did not marry my Kasey until 6 years after we began our relationship, because I was not ready to ever make that kind of promise again, and I especially thought my Kasey was not my forever person.
Through my struggles in finding myself, my Kasey was there. She is my rock, my heart, and my home. Only when I found me, was I able to see the person who felt the same way I did about forever. For better or worse, for richer or poorer....words worth fighting for everyone to have.
Divorce although not an option for us, should be handled with the same maturity and promise that you made to love and honor that person. Life happens, love happens, and yes sometimes divorce happens. Straight or Gay, there is no difference to the responcibilties we have taken on, and we should honor even the end with dignity.