What should I do 😞

So basically me (m21) and my gf (f21) met randomly through snapchat and we became good friends for 3 years and I confessed my feelings to her and she was feeling the same too and she said yes. We both are noob lovers .Our classes got over after I proposed and I immediately started some competative exams coaching and she was planning to take masters in another state. She was a big hyperactive girl and she slowly becomes really mood off smthg like that, she said that " veetil irunnu maduthh, its getting so bored at house" etc etc, it was for 2 and she moved to TN for masters and she suddenly changed and apologized me for being weird and all ( I said her that it's okay take your time, i tried my best to cheer her up all the time, when she was at her home), Things were going real good until she came back to her home for Christmas vacation, after Christmas I found she acting a lil weird, like how she used to behave back in the days, I called her one time at night and she said she can't do this, it's getting so hard, relationship il aakiyathinu sorry angne angne. I was like, take your time maybe pand nadanath pole aayirikumm ithu enn. She go back to TN and after few days i asked her about this and she's still on that saying sorry for all this angne angne, she says ee relationship onum enik work avila, sry for doing this. Idk what to do, Help me out guys🙂