boyfriend of 8 years saying he wants to be single after argument will he come back of I let him have his space?

Take a second and read your entire question again slowly.

Now let me just say this: He wants space.

Scenario A:

You don't give him the space. He feels angry. Like he's trapped and no way out. He feels like he's forced to be there even if there is love. He'll only grow to resent you. He will. I promise. We're human. We were'nt made for one person only. So relationships take a lot of care, nurturing, risks, and effort. Take this as a risk.

Scenario B:

You give him space. Not too much. You'll text him maybe once a week and check how he's doing. He gets the space he needs He feels relieved. Something he hasn't felt in forever. He might go out with his friends. He might go hit on other girls (I know. Hearing that is painful). But you have to make him feel like it's his choice. He needs to feel like he's controlling his decisions. He'll go out with a few chicks and he'll realize the world is filled with crazies. Tons of them. Girls are ticking time bombs in my opinion. One thing can make them go crazy. He'll only realize you're his bff, that he needs you, and there is no girl like you.

Scenario C:

He goes on the break. He loves it. He loves the flirting the sex the freedom. He's on a roll. He realized he was born for the single life or maybe just for someone else.

Every scenario has it's pros and cons. I hope you were leaning towards Scenario B. You have to take the risk and make him feel like he has a say in his own life. He may fall in love with someone else? So what? Clearly he didn't feel for you the way you felt for him. Why be with someone like that??? I've dealt with this. My bf had broken up with me bc he felt closed in. Hurt so much. 6 months later it took work but it hit him how much he hurt me. He came back to me. We've been together for three years since. It's been hard but I feel like no couple is as close as we are. They have to lose what they had to realize what they will be missing out on. If he doesn't come back, I promise you he was never the guy. He didn't deserve you. Promise.

It sounds like you have driven him away. You admit that you net through his phone? That was a violation of his privacy, and in his eyes it was a sign that you didn't trust him. You also admitted that you nagged him? To him that means that you are not satisfied with him, and are constantly dissatisfied with him. He probably decided that you were more trouble than he wanted.

The good news is that you had two kids with you. That means that he is obligated to provide child support to you. Text that message to him, and he will answer.

Sometimes you have to set things free, and if they come back..it means they love you.

From where I'm sittin, you could both benefit from a separation. See an attorney to arrange visitation and monetary support for your two children.