he rarely initiates anymore?

Lei
I feel a little embarrassed about all this, hoping nobody judges me or anything 🙈
My boyfriend rarely initiates sex these days, I don't mind initiating most of the time, I actually quite enjoy it. 
A few months ago my boyfriend and I had a chat about all sorts of stuff. He mentioned how I never started sex, and it bummed him out a bit as it made him feel unwanted. I felt so bad, I nly didn't initiate before that because I was still so shy and self conscious (sexually). After a while, I started initiating, which I know he loves. He's never said 'no' to me when I have initiated. 
Though this last month, it's been me doing all the work to get things started. Like I said before, I don't mind doing that, but now I'm the one who's starting to feel a bit unwanted and it's feeling like sex is becoming a chore to him. My sex Drive has been through the roof since we got together (before my boyfriend, my sex Drive was non existent!). 
We see each other for 3 days in a week. Last week, on the first night we had sex, awesome. The second day, nothing (which is totally fine!), the final day, he was teasing me and turning me on alllll day! But then walking away or acting like he never touched me. If I would try and continue anything he'd be uninterested. I don't get it? 
I'm not sure wether I should bring this up with him? Or just stop initiating and see if he tries? Anyone got any ideas or thoughts?