What you would you do if you were me?

I am currently in a 3 year long-distance relationship with my girlfriend. We are both fairly shy, but we have spent a lot of time visiting each other's countries and we are very close. Recently, after some problems that were entirely my fault, she started pulling away. When I finally got her to talk to me about it, she said that my actions might have damaged the relationship beyond repair. She even tried to get me to break up with her because she couldn't bring herself to do it.

We never actually “officially” broke up, and the day after that conversation, she started messaging me semi-normally again. We had deep conversations about what was happening in our lives. She even called me one night, staying up until 6:00 AM her time since she is four hours ahead of me, and it felt great. She was also sending me Snaps, filling me in on what she was doing who she was with. However, last week she started pulling away again. We still text every day, but her replies are getting shorter and taking much longer.

The first time she distanced herself, I wanted to talk so we could fix things, which is what led to her bringing up a breakup. Now that she's pulling away again, I'm terrified to initiate another real conversation because I'm afraid it will lead to us actually breaking up. I feel absolutely terrible. I want to work things out, but our conversations are completely shallow right now. I’m stuck between just letting things go on the way they are or trying to get her to talk to me. I want things to go back to normal. I’m really not sure what the best plan of action is.