my boyfriend has just stopped taking heroin and is taking subutex?

only he is snorting 2mg instead of taking an 8mg oraly,he has done this for the past week and is going to take 1mg tonight,my question is,is there any difference between taking it oraly and putting it up your nose?i think it might just be an excuse,ive had 8months of lies n stress,ive tried to be supportive but im nearly about to give up,really need to know from someone who "has the t-shirt!"

: http://alcoholdrugstreatment.info/my-boyfriend-has-just-stopped-taking-heroin-and-is-taking-subutex