<human>: Can you succinctly summarize the text in 1-3 sentences?

Hi r/relationships!

Me and my boyfriend Craig have been together for a year, and his family is very broken. His dad Lou is super nice, and his little brother Chris is like my own little brother. His dad has been a very tumultuous on and off again relationship with his girlfriend of about 2 years. Apparently she used meth behind his back and that's why they kept breaking up. 

Now, Craig told me a little over a week ago that is dad is using meth. He will leave Chris home alone for weekends at a time while me and Craig are at school (45 mins away, no car) to see his girlfriend, and presumably get high. Craig does NOT want me to report this to CPS because his family is very broken, and his deadbeat mom would most likely get custody of his brother. Either way, Chris would be miserable, because he would have a drug addict father or an abusive mother who tries to isolate him from the rest of the family. 

I don't know what to do. I love Chris like my own. I am honestly disgusted by Lou's behavior. He promises he's not using but won't come home for days on end until my boyfriend finally threatens to take Chris away, then Lou will straighten up for a few days and will go back on everything.

I know I sound frantic, but what do i do! Please help.
<bot>: Boyfriends dad uses meth. I want to report him to CPS so boyfriend's little brother will be safe. Both options seem bad. What do I do.