@TheGoodNamesWereAlreadyTaken I'm so sorry you're going through this. I went through very similar with my DH - back in the summer, things just hadn't seemed right for a while but he clammed up and wouldn't talk. Eventually I got it out of him - I told him I KNEW something wasn't right and he as being unfair by hiding it and not being honest with me. And he said pretty much the same thing as your DH - "I dont know what I want any more, I love you but I'm not sure I'm in love with you any more".
I felt exactly the same as you, I could have written all of your posts in this thread. I was absolutely devastated and I was definitely guilty of doing the 'pick me' thing. I just felt absolutely worthless and wondered why I wasn't good enough. After he dropped that bombshell he just kind of dithered about what to do - he was going to go and stay at his brother's but couldn't decide if that was the right thing to do, blah blah. So eventually I took control of the situation and I went and stayed at my friend's for a few days.
It was very hard and like you, I really struggled with not contacting him. But as hard as it is, you do need to limit contact and give him chance to miss you. With my husband, eventually I started feeling stronger and in the end the anger took over and I told him to stop pissing me about and to just leave. I meant it too - I'd reached a point that I couldn't take the anxiety and uncertainty any more and I decided I'd rather be alone than constantly agonising over what he wanted. So I told him we were over.
He eventually admitted that he'd been depressed for quite some time (I felt really bad that I'd had no idea, but then again if he'd not told me then how could I know?) and it had just completely took over and clouded all his thoughts - he said it just made him feel numb towards everyone and that's what made him question whether he still loved me. But when I said I'd had enough and it was over, it shocked him into realising what he was about to lose.
We're in a better place now, we talk a lot more and we are more honest with each other about stuff - however I'll be honest, it's definitely shaken my trust in him a lot.
I hope that it does turn out the way you want it to - but IF he decides he wants to separate, at least you will know, you'll have an answer and you won't be in this awful limbo any more. Take control. Limit contact with him unless it's about the kids and if you are tempted to message him then post on here or message a friend instead. Either way, you will be OK x