Is crying "normal" in a relationship?

crying is normal, however not at everything. You are right, when a girl crys that often you wont know when she really needs support or when she is just doing it for attention. I actually use to cry often with my boyfriend as well (not as much as your gf though) and he and I talked about how he felt (exactly how you do) and we both have come to a comprise that i have to not cry all the time if I want him to have emotions for me when I am crying. And also he is trying to be more understanding, such as if its that time of the month or so on. Tell her exactly how you feel, and both of you should talk about it and come up with a comprise. It will make the relationship stronger and better, ours is!