Husband says I don’t trust him...?

To give some back story, my husband was CONSTANTLY asking why I didn’t pick up DS the SECOND he woke up from a nap and started crying. Our baby monitor is hooked up to our phones and sends a notification when ever there is movement or noise detected..I wasn’t letting him scream or cry for long periods of time, at most it was leas than a minute for me to pee before getting him... It got to the point where I started feeling judged so I began turning off his baby monitor during the day so it wouldn’t be blowing up my husbands phone during nap time. A small reason also why it made me feel better doing this is because my MIL has made comments to my husband to tell him to secretly record everything I say and do, and I have no idea if at some point since we’ve had the monitor if she has been given access to it, since it doesn’t say who has access to the monitor. Again that’s a small SMALL reason why, not the main reason.

My husband noticed yesterday that his baby monitor was off when he got home and realized he hadn’t been getting notifications lately during the day. So I told him, everything I listed above, and he kept accusing me of not trusting him, when in fact I do and I told him that about a dozen times last night. I don’t trust his mother to not do something like that. He did say sorry that he made me feel that I was being judged but he kept reiterating that I didn’t trust him... so HE decided to sleep on the couch last night, over something I didn’t think was that big of a deal.

I’m not sure what to do or think, but this has seriously pissed me off for the fact I kept telling him I trust him and he kept saying I didn’t. So I don’t know what to do?