Sharing Our Innermost Thoughts

Me(23M) and my girlfriend(23F) started dating 9 months ago. We were PG mates. We finished our college 8 months ago. She’s 700 km away from my home. Due to the long distance we kinda had a fair amount of bumps in our love life. Last October my dog got sick with CDV ( it’s like AIDS for dogs, untreatable). I was taking my dog for almost all the big veterinary hospitals in Chennai but nothing worked. Due to all the traveling I couldn’t talk to my girlfriend. After a long heavy run I had to put my dog to sleep (euthanasia), It was the hardest choice for me.
After that, for a week she and I connected to our love again. But this time I felt that she was kinda distant. I was really in a bad mental health cause of my dog’s loss (she was my whole world).
The second week I got a job in Assam, I desperately needed a break from my dog and my distant girlfriend so I took the job and went to Assam for 21 days.
After coming back from Assam she was more distant from me. That made my mental health even worse. I kept asking her, she said she’s fine. But I know she was not. A month has passed.
After that, this time I got a job for another state. And I told her to use this 21 days to see what went wrong in our relationship. She said okay. While I was working on a job she was busy with her family gathering and trips and long bike rides.
I returned on Feb 14 which was my birthday she didn’t reply to me. So I got mad and said some things which I’m not proud of. She got angry and said she needs one week of time. After a week she said again I need one week to think.
I wanted to communicate with her for the whole four months but she always said TEXT ME. Always cut my calls. Avoided problem solving calls.

Due to all the trips and bike rides she got a cold infection which put her into the hospital. Now she says, I will talk to you once I get to my home.

Honestly guys, I don’t know what did I do wrong with her ?. I apologized for my bad behaviour. I constantly overthink about her. All my friends say, try to be patient with her. But i don’t know how ??

BTW, she was raised by good loving parents and I was raised by verbally abusive parents. I really wanted to create my own family with her. But it seems like I’m wrong.