Hmm. He sure behaves like a MAN alright
Our perception of money well spent is well... just plain different!
Men are terrible with things of the house in general. Before I got married, I didn't own a single matching anything, not even towels.
Just don't see the point of it although now I compromise just to make peace in the home. Boy, is that ever the truth
I believe you should just buy the sofa set even if you have to do so by spending your own money or borrow it. $300 is not worth the misery unless you are starving and behind on your utility bills, never mind his blessing or not.
I believe that your under lying feeling is that he does not love you or care about you because he wouldn't even spend that little
money to make you happy.
Never mind the "If he really loves me, why wouldn't he do this little thing to make me happy?" Just get the couch, make yourself happy.
I'll bet he wouldn't cry half as much to spend the same amount on you during birthdays, valentines or anniversaries per se. (If he does, then just drop him like that old couch you hated)
So go ahead, good luck on your new sofa. He'll eventually come around to see all that I mentioned above. (Especially if you have some fun ON the couch