Wow! The Word of God is clear about obedience, isn't it? Something that perturbs me greatly in the modern Christian Church is the emphasis on one's opinion rather than seeking God's. Is not this the same underlying issue with Cain and Abel? Cain gave to God what he thought was right but Abel gave to God according to God's will.
As Christians we are followers of Jesus Christ. We don't follow ourselves, do we? He is the Lord and head of the Church and, if we belong to his Church, then we MUST seek to please him. Running with our feelings just don't cut it, opining on matters just don't cut it.
"What does God say about 'X', 'Y' and/or 'Z'?" - that is the bottom line.
With regards to your marriage - search the scriptures for your answer because the answer is there. If your hubby has not committed adultery, yes, you could leave him but you cannot remarry as long as he is alive. If you still want a husband subsequent to your departure, you would have to go back to him. The Bible is clear on this. (Frankly, I am not looking for any debates - the Bible is clear about this. Please remember that God's grace is not a justification to sin or to do whatever you want to do.)
One simple question. What sort of friendship does your hubby have with the older male friend whom he would have to continue visiting every evening even if you returned to him? Funny ... it's seems to be the one thing that he is clear about and stands up for - not you or the marriage but this older man.
With regards to a husband's leadership role and his desires for his wife to commit sinful acts - the Bible is also clear. When man's ways contradict God's, we choose God's.
And, yes, a husband is the head of the home - that's the order established by God. If anyone does not like it - take it up with the Almighty. Even if a woman does not respect her husband, she should respect the God ordained position. When a wife rebels - she rebels against the order that God has established.
I was married to my college boyfriend for many, many years. Our goals and sense of morality were very, very different (yes, I was young and naive). Adultery was an acceptable part of his development - it was something that "men did" and "women accepted", and even women did. His parents did it, his sisters were quite similar to him, etc. While we were together, he tried to "cover his tracks". (Funny thing - behind my back, he was telling his sister that she should be more like me because I did not "put up with his crap".) Anyway, we were together for 13 years and then I became a Christian. I tried my best to make the marriage a success - I did everything that I could have done without compromising my integrity. God is above and He sees all 24/7. I sought Him for the answer and finally, after a total of 17 years of being together, I left and divorced my ex with a clear conscience. Why? Because I gave it my all and sought the Lord. I don't have one regret because there is nothing that I could have done that I did not do. I left knowing that I had the Lord's permission. I left in peace.
To leave your husband because "he's sleeping in another room" is not a valid reason. If you remarry under those conditions you would be committing adultery. Seek the Lord - He is the God of the impossible. However, if your husband has broken the marrriage covenant - that is another issue. Seek the Lord.