He's just playing games. That's just what drug addicts do. Can you see it? I have a few choice words for him but I'll be **** out if I type them here.
I'm glad you and your son are getting out of there. You are being given a chance to get away. Take it!!! It's survival sweetie. If, he's on speed, he's NOT in recovery. He's a danger to himself, to you and most importantly TO THE BABY Don't take that lightly. Things are getting worse with his addiction and you have a child who needs you. That so-called "man" can take care of himself.
Call your mom and go as fast as you can. You really need some face to face support right now. Maybe you could even put a call into your counselor and let he/she know what's going on. Keep reading and posting. Let us know how you are doing.