My BF doesn't initiate sex!

OK so my BF and me have been in a relationship for almost 3 years now. Our sex life was great until 6 months back.

He doesn't initiate sex or foreplay or even kissing AT ALL. It's always me who initiates it and he reciprocates ONLY if I initiate, otherwise it's always a dry spell for me.

Off late it bothers me and makes me feel if I am not attractive enough for me or is it just his work stress. His work life is hectic that I know. I have even tried to have a conversation about it with him and he said it's not a big deal. But it bothers me anyway.

For the last 1 month I intentionally stopped initiating sex or foreplay or any kind of physical contact that to check if he makes the first move, but he doesn't!!

What do I do??