Relationship problems?

my girlfriend and i have been going out for nearly 17 months. for the last roughly 2 months we have been fighting and bickering about anything and everything. we are completely in love and the last thing in the world i want to do is end it. any suggestions on mending our relationship? i feel so bad because i get mad and she gets her feelings hurt and its almost like she is too numb to even care about us or me anymore.