(This is going to get personal, so hang tight)

Im 18 and a little over a month ago my boyfriend dumped me, the week he dumped me I was suppose to start my period, but it never came. I did some researching and read that you can miss a period completely due to stress, so I wasn’t too worried about it. About a week ago I was supposed to start my new period, which again didn’t come. I am now 41 days late. I’ve read that I really shouldn’t worry until I’ve missed it for a third time in a row, at that point it is extremely important for me to see a doctor, but until then I wanted to ask if anyone else has had this problem? I’m obviously not pregnant because I’ve never had sex, but could this be due to any other underlying problems? Has anyone ever been THIS late due to stress? Also I am not having any PMS or anything.