Is it truly stress or is he losing interest?

I'd like to hear the opinions of everyone but in particular 30-40 yr old career men or business owners about the effects of excessive work related stress on your desire for . Been almost 3 weeks since my boyfriend and I have been intimate but he IS completely overwhelmed with his business at this time. And I know for 95% certainty that he isn't cheating, as 1. I've looked for that too! and 2. Have no clue when he'd have time. I'll mention he is also taking some anxiety meds. Kolonapin I believe. Thanks!