HELP my boyfriends on METH?

HELP me my boyyfriends on METH?
My boyfriend has admitted to using meth before, he doesnt seem to do it all the time maybe once a month? everything will be fine between us and one day he will disappear for days without calling or answering my texts or calls, I am reading up on meth and I would like to know if this is common for a meth user to disconnect himself like that. he has kids also, I am worried he will lose his job, i knew he used to do it alot more when he was a teenager but he is 34 now…and the more i am around him the more i get this feeling it might be a problem… his car is home but no one is at his place, where is he at? who is he with? is he alive? these things are going thru my head. I would never suspect him of cheating either but is this a likely behavior if a person is on meth? I have had gut feelings about cheating and I honestly dont feel this in my heart, but am i just being naive here? help me i dont know what to do. i feel like he may be drowning and i do not know how to stop someone I love from drowning himself. He admits when he uses sometimes but blows it off like its no big deal. i dont think he thinks he has a problem, but not contacting me for days not going to work or seein his kids, I SEE THIS AS A PROBLEM…please give me your thoughts
***well in continuation to my story i went to his place last nite it looked like no one was there…i sat in his lobby and just texted him I AM HERE INFRONT OF YOUR DOOR AND I DONT EVEN KNOW WHY…he FINALLY RESPONDS if u really are there please GO i would NEVER LET U SEE ME LIKE THIS…im so sorry. you were right all along i need help i do have a problem…WELL ME BEING THE ME I AM, i swear i was like a negotiator i said please let me in its cold out here, if your there bring me a blanket….anything i wanted him to let me in. i needed to see him. i finally could see the tv light from under the door crack and knew he was there i heard him take a shower, he finally let me in, i have never been more saddened in my life. to see his condition. he told me this wasnt him this wasnt who he is and i said BUT IT IS! i didnt discuss he and i or IT because i knew he wasnt in the right state of mind. he even said he wasnt. he looked like he hadnt eatin in days. or slept. i remember all the symptoms and feelings from when i was a teenager…he was coming down im sure…i looked at his window where hed places 2 blankets over it possible to block out the noise of traffic from the street. He told me he loves me so much that he didnt want me to see him this way, I KNOW NOW HE HASNT GONE TO WORK and will probably lose his job, i am suprised he let me in. I AM IN LOVE WITH SOMEONE WHO IS SLOWLY Killing himself. i dont think i can just let him go and do that. I need to know from someone who has been under this drugs control if there is anything i can do to help him, he did say he needs help and he is sorry that i was right all along, but he was in no STATE OF MIND LAST NITE for us to discuss anything other than that. its like he wanted to run fromme he didnt want me to judge him and i wasnt i was there because i was worried and because i care what happens to him. please give me your thoughts if there is something i can do, if he wants the help. i am in no WAY A NEGATIVE person to him, i have always been the one to save his day but this thing is bigger job and i feel broken hearted and completely helpless
i feel like he has an addiction to drugs and i have an addiction to him.