If we are trans we cannot apologize for it for nothing can be done. Sure, we can feel bad for having omitted information perhaps thinking we could fix ourselves but that is all. If you know inside your bones you are trans there is nothing to apologize for anymore than a tiger can apologize for its stripes.If your gender variance can be curtailed due to absence of or milder dysphoria and this is the line which will keep your relationship intact, then by all means do it. However once you encroach on the transsexualism spectrum much less can be done lest you suffer depression on a repeating cycle.
I've been there so I can very much relate to those who feel they have burdened their families but in truth the crime is far less severe than others would have you believe and you need to know that if you are ever going to be mentally healthy and right in your skin.