Starting, you say that you have no one to help you and you're all alone. Apart from us lot (and believe me, MNs got me through hell last year) you have a wonderful person to help you - yourself.
The trouble with the early stage of what you're going through (and reading your posts, I feel your fear, anguish and pain, and I remember feeling the same), is that you're playing catch up.
He's had months to prepare himself for this; he's rehearsed it, and gone through various outcomes and scenarios in his head. You, on the other hand, have had a bombshell dropped on you, and you're in utter shock and panic. So you're feeling very vulnerable, and this makes you doubt your ability to cope on your own.
But you will cope - and you will get through this. Your heart needs to catch up with your head, and that takes time. You are stronger than you think; I promise you this. But it is such early days, and you can't rush through the emotions and feelings, to catch up to where he is.
He is lying of course about sleeping on the sofa. He is telling you the minimum he feels he can get away with. This is to make himself feel better. Also, he wants you as Plan B. I was Plan B; my ex, or Twunt, as I affectionately call him, never admitted to an affair. He wanted to leave us, but only in the summer when it suited him. I was supposed to put up with his shit for months and months, and then wave him on his happy way. I took control and chucked him out in April, and took away his Plan B. He was bloody furious. The anger from this man towards me - the wife he had been cheating on for months and months, was palpable. This is because in his head, I was the weak woman - he had to make me into this person, so that he could feel justified in leaving me. When I got strong and took my own future in my own hands, it blew apart his perception of me, and suddenly he had no fall back plan, if his new life didn't work out.
You will get fed up of me saying this hunni, but please, take time to lick your wounds, don't see him or contact him. Take control - you are in charge now of what happens to you. He's worn you down and eroded your sense of self; that's understandable, but dig deep, lean on us, and be kind to yourself.
Small steps - at your own pace.
And, one more time - NO CONTACT.