Life expectancy w/ stage 4 colon cancer mest to lung and liver?

I know i'm asking for an ans for which there is no definitive one...here goes. My boyfriend was diagnosed w/colon cancer 4 years ago. had surgery, chemo, radiation, removed large section of colon. 2 years ago and pretty much non-stop, chemo, radiation, then mest to lymph nodes, lungs and liver. had cryo laser surgery done in nov, said was good. but then got lung infection, cea up to 49, 3 weeks later, 156, Jan 2 Cea 250 w/ 15 lesions on liver, excructiating pain, still doing 10 chemo pills ago (not responding). went to er last night, liver's enlarges, sent him home w/ stronger pain pills (was vicadine, not sure what now) but still has to double up to minimize pain. He's given up,(is pretty mean) says the doc's haven't given him a time frame but told me not to buy him a birthday present (aug). he refuses to talk about it, says it will jsut upset me. I say I have a right to know. help? ideas? timeframe? he's 55