Unsure of what to do

I've been in a loving relationship with my girlfriend for over 5 years, we recently bought a house together and since then things haven't been the same. We both have pretty good jobs and money isn't particularly a concern but I've noticed little things creeping in. We used to have sex a reasonable amount (2-3 times a week) but now it's maybe twice in a month, I've asked her whether she's still attracted to me and she insists she still is but I'm not sure she's trying to protect my feelings. We've always had a pretty one sided sexual relationship (where I have nearly always been the initiator) which I've never particularly minded and I always make her feel wanted by telling her how great she always looks (which is rarely reciprocated) but now I just feel unwanted. The rest of our relationship is pretty healthy, although I feel I have to organize everything we do as she never suggests ideas, we do lots of activities together and separately but I'm at a loss as to what to do as she just won't open up. I don't want to lose her but equally if there's real issues here I'd like to resolve them (even if I won't like the outcome). Any advice is greatly appreciated.

Try showing that you don't want sex as much, ten maybe she will want to. That's the way girls are.