I agree to most of the comments here. 5 years is a lot of time for her to realize if she wants to spend the rest of her life with you. Now bro there are a couple of things, grass is always greener on the other side and she might see that but after a while the same cycle continues, she must have gathered every bad habits of yours that she knows about you and all the fights you guys have had in the last 5 years and come to a conclusion that you are not for her. May be a lot of factors surround your circumstances but most important BORING relations, lack of excitement. BUT thats the nature of every relation, the passion isnt the same it was after the first few months of a year. You both live together and like married people and you findout both good and bad things about each other the difference is married people are stuck and compromise due to kids, family ties etc BUT you single people aren't bound by anything but by your emotions and love so YOU guys have a choice. AND lastly again the idea of that "the grass is greener on the other side" may work out for both of you or it may not. Try your best but dont sweat over it. If she is yours she will be yours and so on, GOODLUCK