While we're not actually a couple at this point, I have been talking to a guy as of late who's been super great about my transition. We were actually acquaintances before, and never really talked much one-on-one before, until maybe 2 months ago. He broke up with his girlfriend, I came out on fb, and he hit me up, and we've talked every day since. I know since we're not actually dating it might sound silly, but I feel like my experience with him has already enlightened me in so many ways. He's honest, respectful, smart, hardworking...A lot of which I haven't experienced in any of my other relationships in the past. Just talking to him I can see where all these relationships in the past went wrong, and where they were just wrong from the start.
We pretty much don't talk about my transition, and that's how I personally like it. However, the few times we have talked, I've come to realize that he doesn't really know much about the transition process (he thought T would get rid of my chest and that I can just buy a penis one day). I'm sure over time, we'll discuss it a little more in-depth and he'll have a better understanding, but for now, this really works. He doesn't treat me like I'm trans, he treats me like I'm the person he cares about. Even though he doesn't know much about the transition process, he doesn't seem to care about that. We just generally enjoy spending time together.
As ridiculous as I might sound saying this, I've already learned that it doesn't matter what's going on in other people's relationships, or what may have happened in past relationships. There is no comparing what someone else might be going through to what you have. No matter how much we read from others' experiences in here, the world of transition is always new and scary, and there's no telling what life may have in store for you. I was so anxious when I first started talking to this guy, as I've only ever been in straight girl/guy relationships in the past. I was awkward as hell because I didn't know what to expect or how to act in a guy/guy relationship. But now that I'm able to be myself, I'm a lot more comfortable, and everything feels almost natural.
New relationships are always a little weird at first, getting to know the person and figuring out how compatible you guys are. Good luck, I hope you find happiness in this relationship. Treat cis/FTM relationships the way you would any other; build trust by being as honest as possible, and show that you care about them no matter what. The best relationships are built around a strong, well-balanced mental connection.