A.B.
It is important that you recognize what is going on here. Many times parents in your situation will not acknowledge that what is going on is really for their own benefit. Your son probably does sense something between your and your spouse. I am sure you have thought long and hard about the implications of your current situation on your son.
Like the PP, if your son starts in his room, it is better than him starting out with you. You may just slowly start working towards helping him back to bed.
And IMO, unless your spouse is willing to get up with him during the night, he has NO say in how you deal with this. It gets my goat when a spouse, who has the luxury of sleeping through the night and never gets up to tend to a child, has the nerve to voice their opinion on how you are dealing with it. If he doesn't like how you're doing it, he can do it himself. He will see very quickly that sometimes, you just do whatever gets you a little more sleep.