Haven't read all these posts, but prepare yourself girl, you're in for a bumpy ride. My husband and partner of 18 years has done the same, and over the past 6 months has come and gone 4 times, and is trying to get back in the door for the 5th time.
He says the same as your partner - he is confused, doesn't know what he wants etc etc (we have two lovely little girls) and is doing the same as your partner, wanting to help me through my grief and not realising he is actually sending out mixed messages by doing this action, driven by guilt and love, but not the right kind of love.
Who knows what will happen to you? It could be he goes away and realises he's made a big mistake and comes back. BUT don't do what I did and take him back too soon. He has really hurt you, and even if he comes back full of apologies in a few weeks, he will probably want to sweep it all under the carpet and the thing that's been bugging him won't have gone away and you'll have to go through it all again.
If he comes back, tell him he has really hurt you, that your feelings for him have changed and that you want him to go away, get his head together and ONLY come back when he is 100% sure what he wants. You could have lots of talks, but believe me, they will only end up hurting you. You could go for one big talk now, get all your message across that you love him, thought you had a great future ahead of you but taht you won't tolerate being his confidante while he goes through his crisis. Give him his space, and give yourself time to get stronger, then start the talks on your terms if that's what he and you want.
In the meantime, get whatever support you can. If you can't get a grip, get yourself along to your GP - antidepressants helped m y initial terror. See friends all the time and don't worry about boring them. Spend time with people who make you feel good. Book into Relate as they can make you feel so much stronger.
As much as you don't want, you cannot spend your life being defined by another person. You will get strength through your friends and family and by making yourself do things you'd never even considered. It might even be exciting!
I know you feel really crap now and want to know when it will end, but the answer is that you WILL when you are ready, gradually you will find strength from somewhere you never knew you had it. Do not let your life become a disaster because of a few failed relationships - you are obviously worthy of love in order to have had them in the first place and when you are ready will meet someone else. Relationships fail everyday, you just don't think it will happen to you, and when it does, you think it's the end of the world. But it's not - there's far worse things that can happen so count your blessings and put on your happy face when you feel up to it. Then get online and start shopping for fun dates!!!
Good luck, I hope this doesn't sound flippant, I just mean there is more to life than one or two men - the most important thing is learning from the relationships you do have and working on how to be a h appy, independant woman, whether you are with a bloke or not. You'll get there, it's all just scarey now. I'm nearly there, and honestly, I was a bag of snot and tears for weeks. Still get my moments, but they are not as frequent and I'm starting to see that our marriage wasn't all rosy. And the laundry pile has gone down massively!