My gf's nature is totally changed now.why???GIRLS nature are changeable???PLZ HELP Q IS BELOW:---?

3 months ago,i got my love.i love her much bt she is not love me very much(like me). My gf's nature is totally changed.she is just want to get freedom from CHAT , and all that stuff due to her joint family.she never accept her mistakes and 3days ago,she insulted me.from that day i do not message her and she dont msg me also.she is my 1st love.why she is changed nw??due to other tensions like FEAR OF RESULT?? other tensions affects on love relation ship??we r in long dist relship..plz help me in detail......plz i m tensed.I dont like girls nature if its changeable...!