I agree he is talking about it... so maybe it would be good for both of you to spice things up a bit... I personally like the lake picture.
Besides ... Im thinking its normal to lose motivation sometimes.... I know its true for me... Right now I should be studying for my next state test... but I just dont want too, that happens now and then.. So it will probably pass.
Maybe he needs something new, maybe he is more bored then losing motivation?