Me [31M] with my girlfriend [25 F] 3years growing apart or ashamed of me?

been with girlfriend since 2013 i feel as if we are growing apart..she use to be up my ass calling me all the time..couldn't keep her hands off me...the way she use to look at me was filled with love and pride...now not so much...she wouldn't let a day go by with out talking to me at least once..she use to hit me up like over 5 times a day and more...

i have bent over backwards for to make her happy or be there for her when she needed me..i thought i was being a good bf well at least in my mind i was.. she puts up pictures on facebook and edits me out... and only hits me up when she needs something..i text her and she doesnt respond untill days or hours later..when i know she has her phone and is not busy.. i recently seen that she just friended her ex on facebook

TL;DR no intimacy i feel alone only calls me when she needs something