Thanks all for the replies, it helps me a lot.
I figured the reason why I'm struggling now is that I have no place now to express myself. My girlfriend knows and understands that i'm bigender. She does however not like the cross dressing but she handles it. She accepts who I am in that context.
But during the day when I feel feminine, like a woman. And I mention something that makes me sound like a woman she visually gets upset in her face. If I call a girly dress cute, she looks strange at me. She always calls me masculine pronouns which hurts me every time. When I talk to her about these things, she always goes into defense mode and results in saying "You should find someone who is bi and would love for you to dress up as a girl". I don't have this safe relationship where I can freely talk about these feelings because the moment I open up a bit more, she goes into defense mode and starts freaking out and saying that "I should become a girl full time, its clear you are happier as her." or "You are way more sexually excited when we have sex when you are a girl".
This happened every time we talked about it so I have this feeling built up that I cant talk to her about it. She says she is ok with me dressing up, but I see it in her eyes that she hates it. That she wishes I was just a normal masculine guy.
And some days its perfect, she is loving and she calls me cute sweet words. The dysphoria is there every day. Some days very mild, some days very hard.
I have my triggers like, seeing a beautiful woman passing by, I cant help but think "I wish I was her". Someone calling me sir, I cant help but think "Bleh, I don't want to be called sir, I would love madam more".