Can weight loss affect my period?

My boyfriend went away for the summer and since he left i haven't had anyone to make me eat during the day. as a result, i've lost about 10 pounds and now only weigh about 100lb. could this be the cause of my period being late? i was supposed to have it about 2 weeks after he left, and i never got it. i figured this was due to stress (my period has a track record of skipping out on me for up to 3 months at a time), so i didn't worry about it. then it was supposed to start sometimes this week for this month and it hasn't yet. could my weight loss and stress (just started a new job too) be postponing my period?