Interesting Phenomenon

Today while I was in school, I was walking behind this couple but I found out an interesting thing. Though they were couples, they seem to have quite a huge distance between them - like when they were walking together. There isn't any hand hold, the girl and the guy had NO body contacts and the girl's hand which was nearer to the guy actually was holding on to her own bag. Alright, say the girl was on the left and the guy was on the right. The guy had his bag slung onto his left shoulder and his left hand was hanging freely though. For a few times maybe a total of 2 mins out of the 15 mins walk they were well.. their hands were within 10 cm of each other, I did expect them to start holding hands or something but nothing happened; and for the rest of the 13 mins, they were standing apart with roughly 30cm of gap(from hand to hand). From a book of body language that i own, its stated that a person's intimate zone is from 15 - 46cm(measured body to body) and personal zone is from 46 - 1.2m. Hence I can say that the couples arn't ready to become couples since they are only at the border of the intimate zone and personal zone. Even I and Mich/Wanlin stand closer than them la. Another thing is thruout the 15mins walk, there are very little eye contacts between both of them, girl doesn't really look at the guy and vice versa. Both are looking forward and definitely not focused on the same thing. Eye contacts are very important in a relationship since they actually can convey more emotion to the other half than using language. Definitly also, little touches in a couple says alot about the bond in the relationship. Of coz I have also explanations about the mindset of the guy and the girl but I shall not talk about it here since to a certain extent it involves religion and this blog maybe looked upon by them. (OK, I know this couple but no names, and I am NOT a stalker)
Conclusion is... not here not there, no idea what they are doing...