Don't buy flowers every week.
That will become as BORING and habitual as buying them for Valentine's Day!
Roses after a night of great sex is a good start.
Again, don't buy flowers EVERY time. You've got to get AWAY from ROUTINE.
Someone else suggested a back rub. Great idea. Rub her back and say something like (even if it is NOT true), "Your skin is a little dry. Let me rub some lotion on you." DON'T have the lotion waiting by the bed, because then it will be OBVIOUS you had that planned. Do it expecting nothing in return. Foot rubs are always good too, especially when there is some good conversation too.
Do you watch "Everybody Loves Raymond?" Great show. Anyway, there have been quite a few episodes similar to your situation. Side-splitting hilarity. Anyway, watch the show and MAKE SURE you NEVER behave like him! He is a total idiot of a husband!
I have watched some of "Everybody Loves Raymond." I agree, Raymond is a douffass!
But, then again, maybe I have been too in my own way.