Yes, basically he is taking your attention when you should be working. He is giving you unsolicited advice when you are not asking for it, which makes you question your thinking. Bluntly put, he is making it about his need to know everything, and have your attention.
And then you say, it is fine, he is being approving (I paraphrase) so what you are doing is framed in relation to him, instead of how you feel about it and what you think.
I cannot remember who posted it above, but the piece of advice to find someone else to share your work and business ups and downs with is spot on. It is natural to want to have someone to share with. But that needs to be a positive and mutually affirming experience. Not have you questioning yourself.
Control is really subtle. And even the extreme examples do not start off as extreme. We are not taught what to look out for and it is only once you realise you have no time for yourself, that everything you are doing is being monitored and commented on, and in some ways limited, that you start to question things.
So for example, a case where a woman has to sit in front of a video-camera every time her husband goes out so that he knows she is not doing anything he would disapprove of - we immediately see that as control. But constant interruptions and discussion about what we are doing - harder to define because the person doing it can just say they are showing interest and being supportive but the effect is still that he thinks he can come in when he wants, take your attention, know everything you are doing, and put his views on it. (He is just being a human camera, really).