My DH is kind of the same way, but he tells me he loves me everyday. However, he doesn't put it out there whenever..usually when we are saying goodbye on the phone or if he or I are going anywhere. I often wondered the same thing...How does he really feel??
But just as you said, it is the actions that SCREAM louder than words! It took me a while to sit back and see this. One I did and took notice of all the little things he does just to make me happy, the wondering stopped. I knew.
For example, this past weekend I told him that I emailed on a couple of Mille Fleur D'Uccle chicks. He is not fond of the number of chickens I have but he smiled and asked "what do they look like?".
So I showed him and he said "Cool, when are we going to get them?" I told him in the after noon. So the time arrived and it was time to go, he offered to drive so I wouldn't burn my gas up AND offered to pay so I didn't have to break my 20 dollar bill! As we were standing talking to the seller of the chicks, he offered me a couple of mixed breeds for free. I turned it down and said that we have enough for now. DH replied "Yes, we didn't really need these 2, but if it makes her day, I am am all for it"
That is just the kind of little things he sneaks in there to make me smile!
Sometimes all it takes are simple little action to really know if someone loves you!