Sex Life

My sex life with my bf has gotten less over the last couple of months. We’ve been dating a couple months over a year.

Sex used to be 2/3 times a week, now all of a sudden it’s once a week and I’m usually the one initiating.

I’ve communicated my concern to him, and he said he’d just been tired lately and that we’ll bounce back. Otherwise, he’s flirty with me on a day to day basis, and affectionate as he normally is.

How patient should I be before I start getting worried that something is wrong between us? And is there anything I can or should do?