This depends on your goals and desires in life. I have been in long and short relationships and I have found that even the painful ends are usually worth it. Secondly, relationships need not end dramatically at all, most of my breakups have been amicable and civil.
I am not trans and I have no experience with this sort of thing, however femboy might be a safe transitionary identity for you. That is of course, assuming you are comfortable with the label.
However, this is just an observation from an outsider. I am sure someone more qualified will have a betyder answer than me