My partner came out as trans

Hello everyone. So about a month ago my partner came out and said she wanted to dress like a women and liked being in what she said was "girl mode". We had a conversation and discussed a few things. And she was leaning more towards gender fluid at the time. Well Two weeks later she decided to talk to family and come out as transgender... which is a conversation that we hadn't even had yet. I am so very overwhelmed by it all. I am doing my best to push all my feelings aside and i am supporting them fully. But inside i have so much going on and no one to talk with. Every article and evey person says your feelings dont matter and to suport the peraon transitioning. I need advice on how to handle this. I feel like my feels are just pushed in a dark corner and its really affecting our relationship.