wow-to me you guys are young-so remember this snippet of advice comes from someone old enough to be yer mum
first of all i think you are taking way too much responsibility for "his" happiness. yes-i understand wanting your husband to me happy-and i like a happy hubby too. however, i get this feeling thats you think its your TOTAL responsibility to make sure he's happy-and its not.
also-something here sounds contradictory-you say he doesn't like going out after work-but then another sentence i read had him single once, breaking plans to go out with friends on whim.
it sounds like he is in his man cave-possibily adjusting (and yes i think it takes guys longer) to married life.
the best possible idea i have is just sit him down. flat out ask him if its going places he minds-or if its going places with YOU. you might be surprised.
and on an end note-i don't think people should ever stay together because of their children. i am a child of divorce-and our lives were much more peaceful and healthy with two parents that were happy apart than miserable together. i am also remarried. my children are thriving now that they are not in a household with constant bickering and tension. sometimes people say "i shouldn't leave-because of the children." i personally think sometimetimes the best move IS leaving-FOR the children.
JMHO.
((hugs))
sheebs