Am I ruining a good thing?

To start off, I have recently started my MtF transition, I have been on the hormones for a week, working on my voice (though thinking about professional help there), working on my appearance (getting laser facial hair removal) and even started to scope out clothing options.

I also have a really supportive girlfriend of 8 years. Sure like most long relationships we've had our ups and downs, but we've stuck through it and had a lot of fun. She is really supportive of my transition which is really helpful for me. She is also really supportive and helpful with my other mental issues I have which also helps.

The problem is, I don't know what to do anymore. I am so confused. With my girlfriend the good times are lots of fun, but the bad times have been more common, sporadic and very emotionally and mentally damaging/draining. They have gotten to the point where I am breaking down at home, my one safe zone, because of the conflicts we have.

These conflicts aren't even of things that matter, they're just of conflicting thought patterns. It's something that's been around forever and I guess has just become more apparent as my mental stability has been on a downhill slide these past few months.

Additionally, as is common with trans people, I want to get the experiences I missed out on. The experiences that were meant for me but I didn't get. I want to try things and such. This doesn't mean I want to go out and start have random sex because that isn't me, but I want to be able to go with the flow if things happen between friends.

I do love my girlfriend and care for her deeply, but I don't know if it's healthy to be with her anymore and if I'll regret staying with her and not being able to try the world as my new self. I have talked about it with her, wanting to try new things and have told her that I need to look out for my mental and emotional health more than the relationship. I've also told her the truth in how I'm feeling that I am confused and as expected she isn't happy about all this, not that she's angry but that she's just sad about it all.

I just have no idea what is the best course of action. We do currently live together but have already suggest to live apart in the hopes that it will lessen the conflicts and make the relationship strive, but I also have doubts in that being the fix all. I am just really confused and I sadly can't go down one road, realise it was the wrong and then backup to choose the other.

I don't expect full proof answers, but any advice or insight into this would be greatly appreciated. I have spoken to specialists I see any other people I know who I'm willing to divulge the fact that the relationship is bumpy and they are all giving different answers/responses, so more the merrier and may help me come to a conclusion.