I heard that couples who are actually in love tend to gain weight due to being happy. But me and my boyfriend have been together since we were 12 and now we are 19 ive been weighing 100 lbs since I was 12 I haven't gained any weight I'm 5'2. But on the other hand my boyfriend grew hes now 5'9 and he weighs 160 lbs. I know we are still young but I see other couples gaining weight from being in "love" but me and my boyfriend haven't gained much. Is all that just a myth or what ?