I need to save my relationship

I have a gf that I really love and I cant even imagine my life without her i really do love her when I just think that I'm gonna loose her i get so sad but she is depressed I'm trying me best to help her but what's making it harder is the long distance we are going to meet in 1 month and half she says that she loves me and she can't leave me but at the same time she doesn't feel comfortable with me like she did before and when she's alone she's happy but if I say I love you or compliment her she feels pissed of she misses me but she can't talk to me when I ask how she feels she says "nothing" I asked are you sure? Not better not worse? She say no I feel nothing I tried to ask is this gonna stay like that forever or is it like that cuz the long distance she said even if I was with her irl this time she won't be happy she been like this for a week she js says good morning goodnight and that she misses me and tells me to stay safe and take care of myself or asks me to play a game with her please I need some help and I need to know am I the only one this is happening to