Men only: is it normal that this is happening to my relationship?

Me and my bf have been together for 2.6 years now, all is great, we have had our ups and down of course. My sex drive use t be crazy and in the last few months is completely gone and one of the reasons is think is the contraceptive implant.For him sex is not really a big issue and never was and due to that it caused problems, partly because I wanted it all the time and he didn't really care as much. And nowi have become like him, not really caring as much and in a way it's a good thing because it does not effect me like it use to when I wanted it all when time and he never was really fussed.

I feel like we have become like a married couple and oly have sex like once a week and I hate that. We are both at uni but I am working on top of that many hours and we do go gym so that does make us quite tired too. But you know how things get between couples, I think once it gets to this stage it goes downhill, you both loose the passion and interest and then well other people start becoming more interesting.

Trust me I do do a lot, there is not one second that's don't make him feel loved and wanted, buy him little gifts, and yes do give very good 'blow jobs' in case you guys will reply asking that as I have seen n a few posts haha.

Any help please, what's happening to my relationship? I have always been the spontaneous one in the relationship always wanting to try new things daily and in e bedroom, but I think because he never kinda fully reciprocated back to the sexual aspect as much and now with the implant being in place it's like I have lost that will to try as much. Any views?

Many thanks