Fallen out of love?

erm i went thro a similar thing
what you got to remember is your still young and you've been together a long time
now what happens is you begin to grown up and you panick about getting older and losing your youth probably whats happening to your lad
so hes worried about losing his youth and having to settle down
he "thinks" he wants to play around abit live it up and be young
but in fact he dosnt i was the same
thinking i want to f*ck lots of girls
i dont want to be tied down
so i broke up with my girlfriend
i regreted it the second i said it
my life was sh*t without her
i needed her
i tryed everything to get back with her she wouldnt take me back
i even tryed to commit suicide
what you need to do is get to the bottom of this whole thing forget about an open relationship
you need to talk and ask him whats really amatter ( its hard for us to tell you the root of whats really wrong )
also have you been spending alot of time together lately? cos he may just seem smothered

hope i helped