Lesbian people

I have a girlfriend.
Before she confessed her feelings to me, she used to initiate conversations, talk to me, text me, and she was very sweet and affectionate.
On her last day at school before graduating, she waited for me at school. She kissed me on the lips and confessed her feelings to me. After that, we continued talking on our phones.
After that, she started becoming cold. She stopped coming to talk to me, and she began replying to my messages a whole day later with very short replies.
After that, I stopped talking to her for two days. (During those two days, she never came to me or even asked if I might be upset.)
Then I went to her and talked to her about it. I asked her what was the reason for this sudden change, why she had become so uninterested in me, and why she hadn’t talked to me for two days. She said, “What about you?”
Then she said, “You’re right. My bad.”
I told her, “I only did that because I saw your behavior and your lack of interest in me.”
(She replied hours later.)
She told me, “You’re right. What you’re saying is true.”
When I asked her, “What’s wrong with you?”
Some time later (her sister’s wedding was happening), she came back to me and said, “I want to think before giving you a proper reply. I owe you a conversation.”
And she really did come back.
She said, “Are you upset? I’m not asking if you’re upset to provoke you or anything. I’m just asking.”
I told her that this wasn’t all about whether she asked if I was upset.
I explained everything to her again and told her exactly what had hurt me.
She said,
“Everything you said is true. I know I’m cold, and I hate how cold I am. You don’t deserve this, and I know I’m awful.”
We made up, but she went back to being the same as before. She still doesn’t reply to my messages until a full day later, and her replies are still very short.
(Even though we’ve only been together for three weeks to a month since we confessed our feelings.)
This is supposed to be the peak of the honeymoon phase, when we’re supposed to be deeply in love.
btw we are lesbian
And English isn’t my first language