My boyfriend suddenly stopped wanting to have sex with me?

I’m dating a really great guy for 5 years now and we are great at communication really know each other well. But for the last 6 months he hasn’t wanted to have sex at all. we used to do it once a day. I asked him why he doesn’t want sex from me anymore and he said he was extremely stressed with work. Should I not ask for sex anymore? Keep trying to talk to him or just leave it? I even bought lingerie and sex card games but he has no interest still. and will keep rejecting me like he has for last 6 months what should I do?
My boyfriend suddenly stopped wanting to have sex with me?
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