help! baby male mouse

i have determined that my baby mouse is male.  long story short, now he is 
by himself in his own cage.  all the other female mice are in a huge
habitat 
together.  he is probably lonely and wondering why he cannot join the
other 
mice...?  either way, i am positive he is lonely.  what the heck do i do 
with him?  i do not want to kill him.  i do not want to give him to a pet 
store or to someone with a reptile.  i do not want to set him loose (it's 
still very cold here) and meanwhile, i know that males cannot be housed 
together, they will fight until death (is this true?) and of course, we
all 
know what will happen to him with the female mice (i don't want that many 
babies i have loads of female mice).  what do i do with him so he can have
a 
happy life?  do males like to live alone.  that has GOT to suck.