Me and my boyfriend have been together for 5 years. We have 2 kids together. I love him more then I can say. The first couple of years were great. Then he started to do drugs and is addicted. Ive tried ever thing to get him to stop. He always says he's going to stop and never does. I don't know what to do anymore.

There is nothing you can do till he's ready... I would let him go so the kids aren't exposed to such a life.. And if he wants to still see the kids get a court order where the visitation is supervised.. Protect your kids...

Yes assuming you are living together move out with the kids, don't let him visit without it being supervised as mentioned.
Till he is ready to stop, he won't and you and the kids don't need to be around that. Do you want the kids growing up thinking this is the right and normal life style.

Girl I was in the same stitutation like you but my kids dad ending up in jail because of the drugs but now he is off them thank god to rehab and he is doing better but you need to try to get him to go to rehab or nothing will change it will get worse until he is ready to make himself better and his life with you and his kids but one thing you can never do is give up on him even though its hard I know how you feel but I never gave up on my kids father so just have hope that everything will turn out good