Unfortunately, like prettypoly, I looked and looked and found almost nothing except the insistence that relationships never survive (or, best case scenario, the couple stays together "like siblings"). Even the local LGBT groups I've heard of mostly address LG issues, and there's been very scanty support for SOs as opposed to parents/family. PFLAG, for example, is terrific for family struggling with trans issues, but has almost nothing I've seen for partners - their flagship pamphlet is titled "Our Trans Children."
The good news is that since then, I've made a point of *being* that kind of support, and so have most of the SOs in successful relationships I've known.
I particularly like to tell people that this is like any other major relationship stressor in that there is a VERY good chance of survival as long as both partners are still in love and interested in working hard at maintaining the romantic bond.
(Learningtolive : I very much wish that support for parents and family meant there "must be" attention paid to SOs, but my experience was that when I went to explicitly labeled as "support for partners" groups... well, one was dominated by very hurt, bitter SOs who said trans people were evil and all partners should leave, and one was dominated by trans women who told my wife to divorce me now before I got angry enough to destroy her life. I have not heard many positive stories of attempts to contact support groups, but I'd be absolutely thrilled if anyone could find and post contact information for groups like that!)
