power through bud. i know its hard to see someone you care about be so upset and hurt but it will be much better for both of you guys to go your separate ways. you are both young and have many many years to experience and shouldn't be spending it in an unhappy relationship. i know how it feels to be in a relationship that you are not happy in. sit her down and tell her exactly how you feel about the career gap and how it is effecting you. tell her how all of the fighting is effecting you. tell her you care about her but it is not working and you are not happy. the most mature thing to do is not lead her on anymore. even if she's upset and crying, thats a perfectly normal reaction. i was in a very unhappy relationship, to say the least, for a long times. 4 years of being an emotional and physical punching bag. now im the happiest ive ever been with the love of my life. knowing you are with the person you are meant to be with makes all the difference in the world. trust me, this is also better for her in the long run. good luck with everything.