Male cannabis use during TTC

My partner and I are in our early 30s. We are approaching 1 year of trying, with a chemical pregnancy a few months ago. We haven't conceived since then.

Would you consider leaving your partner if you found out he was secretly taking cannabis to help with his sleep, even though he said he's stopped half a year ago?

I asked him a few times the past few months whether he was still taking it, he said no. But today I noticed that the bottle was being used, like the liquid level dropped abit since I checked last month.

I know this is a bit of a controlling behaviour but ever since my early miscarriage I have been very anxious and wondering if there is an issue such as our lifestyle and habits. I understand that we havent tried very long but he seemed quite hesitant when I suggested that we get tested, although he did agree to if we do have another miscarriage, so it makes me even more anxious just waiting around and wondering