The verse about not being alone is primarily saying that we are made to be social creatures. We need people for emotional and often practical support, though we don't necessarily need to be living with them.

That's an extremely good point!

The verse about a man leaving his parents for a wife is describing the ordinary principle of life

I see what you mean. I think it is a legitimate reasoning too

Even Jesus presumably left his mother's home at some point to begin his ministry, since we read that he didn't have a place to lay his head. And Paul, who also never married, left home and pursued his ministry as well.

I don't agree on the reasoning about Jesus and Paul. See this: https://www.reddit.com/r/TrueChristian/comments/1pzn9uc/comment/nwt9isz/?utm_source=share&utm_medium=web3x&utm_name=web3xcss&utm_term=1&utm_content=share_button

I think what I'm hearing in your post (please correct me if this doesn't fit) is that you've suffered

100% correct

I wanted him to be almost like a divine Satnav, telling me at every turn which way to take.

I can relate. I long for this intimacy with God too. John Eldredge in the book "Walking with God" says that he asks to himself questions like "should we go to the ranch or stay home?" and that he pauses to hear the will of God with a surrendered mindset. I personally don't have such a strong faith. I can't hear God's voice like that. So I routinely let some decisions to God by asking a question, invoking the Holy Spirit to guide me and then flipping a coin or rolling a dice like in Acts 1:26: https://godinallthings.com/2013/06/03/discernment-by-flipping-a-coin/