For some context: Me (M27) and my gf (F27) have been talking about moving in together. Over time I've asked her what she'd need to feel more confident and comfortable taking that leap. Admittedly, it is a big leap for me as well. But I'm trying to make her more comfortable. She told me a month trial as well as some paperwork being processed would be necessary for her to feel comfortable. We choose that this may be good not only for emotional, but also practical reasons. She lives around 1h from my house and I'm the only one with a car. She also lives with multiple roommates, which makes any privacy or intimacy hard.

Going to present time: Now we had that month trial and during it we we're gauging how we were feeling. Through it we both agreed things were going great. 1 week from the end of the trial she and I agreed that it would be good to move in together once her paperwork was processed. Lucky for us it was accepted soon after (2days). I've went shopping with her for furniture (have only looked so far), have bought appliances for the kitchen, and have been looking at apartments nearby. This includes her sending me apartments and places she likes as well and us viewing them. Now - out of nowhere - she's saying that she's having second thoughts and that we need to go to couples therapy first. I've told her that we've both invested in the move and her doing this is a breech of trust as well as a betrayal to me and my emotional investment, not being fair for me. Further saying how it upset me, considering the majority of the burden in our current arrangements has been placed on me. She told the that anyone always has the right to change their mind and she's changing it. I explained that although everyone has that ability, the way your decisions effect your partner should also be considered.

She's also told me that my reaction is also a reason as to why she doesn't want to move in. That because I'm hurt by this it shows that I need therapy for myself as well - which I don't agree with.

AITAH for my reaction and telling her that she needs to take accountability of her actions and reacting the way I did?