Is it over?

I 23(M),mostly studied in boys boarding school and even half of my graduation was online,so I didn't get many chances to meet or even talk to girls of my age except my sister and some cousins,I always loved a girl from my neighbourhood who was also my classmate in my primary school,but never spoke to her after I changed the school,one day,all of a sudden in my final year,she texted me,from there on it went well, both of us got really really close to each other,met regularly,used to go to the movies,dinner dates,late night calls,everything was going well,I always wanted to confess my love but was also scared,recently,I got a job in a far away place due to which I had to leave my home state and I was not able to meet her for five months,in the meanwhile she was busy with her mbbs finals so we weren't in touch for few weeks,i resigned my job and came back last month,but after that,nothing seems to be the way as it is used to be,no messages or calls,she doesn't reply for days to my messages,I tried meeting her once but she wasn't comfortable meeting me alone,I don't know the reason but she is not behaving the way she used to,I was about to confess my love after coming back but now i dont think I should,what might be the possible reasons behind her sudden change in behaviour,should I talk to her about this or is it over?