Slipping...

Is it still Biblical to separate from your spouse if one partner has tried to make it work for a longtime and the other has not listened and has not tried to make it work until it maybe too late? Is it okay to say enough is enough and I need time, if quite frankly you just don't believe them anymore and you feel like you are suffocating in your own marriage? If you have been as honest with the other party as you have been for so long, and telling them you don't know if you want to stay anymore? What happens when you WANT to believe things will get better, and you pray they do and they only seem to be getting worse, and the trust you want to have just isn't there. When the other wants you to still hold their hand and you don't know whether or not you should continue to do so, or let go. When there is no longer a happy medium, it either is or it isn't. What happens then? I still don't have any answers, all I have the answers to is what I know. What I know seems more confusing than what I don't want to happen anymore. I am so confused. I need time, time apart because time around is not working. He wants to stay, I'm not sure that's the best thing. He thinks I'm not afraid, and I am petrified. I am trying to handle this with a level head, a smile plastered on my face for my kids. This is not working for me and I feel more lost now than a week ago. For me, it is getting harder and harder to hold on, I have known for awhile my grip on this marriage has been slipping, and now I can't feel the end of the rope with my legs anymore... I'm dangling, holding on with slippery hands... and I'm so scared.