It's only been 2 weeks. I was in the same situation with my husband and the first time he got clean was "to make me happy". When he relapsed he said he didn't have a drug problem, he had a wife problem and that it was me making everyone miserable by making a big deal out of things.
I kicked him out like you did. You did the only right thing you can do in this situation. It's up to him to get clean, and it's up to you to take care of yourself and your children.
My husband went into self-destruct mode when he left. It looked like endless partying, but he knew he'd lost everything and didn't think he could get clean. It also took a while for him to accept that he did actually have a problem.
The kids and I barely saw him during that time. It was a very difficult time. You're now a single parent, you're worrying about your ex, and there's no one to take the kids at the weekend or talk to when your ex is a drug addict. I felt very alone. My children were also struggling with their dad suddenly disappearing.
You're allowed to feel angry and sad. It isn't fair and it's not the life you'd wanted, but this is how it is. He may or may not get into recovery, but that's on him. Not you. You have no control there.
What you can control is getting support for your children through school, and support for yourself. Make some changes and fresh starts. I gave my house a makeover. I reached out to friends and discovered sadly that many had had just as hard a time of things, they just hadn't said anything.
Act on the things that you CAN control.