when a scuba diver has 'the bends' he/she gets oxygen bubbles in his/her blood vessels. so it could be about getting too much of what you need to the point that it's harmful or uncomfortable, maybe just replace oxygen with love or friendship (hence the girlfriend/friends references) and maybe its about wanting to be alone for a bit. it might be a metaphor for that.
when a scuba diver has 'the bends' he/she gets oxygen bubbles in his/her blood vessels. so it could be about getting too much of what you need to the point that it's harmful or uncomfortable, maybe just replace oxygen with love or friendship (hence the girlfriend/friends references) and maybe its about wanting to be alone for a bit. it might be a metaphor for that.
of course, i might be wrong.