I think it really depends on the situation. If the addict really wants to get past their addiction and takes action (counseling, rehab, etc) then it is very beneficial if their loved one stands by to support their journey to sobriety. In fact, it is statistically proven that an addict is much more likely to break the addiction if they have support of friends, family and loved ones. However, it really depends on how healthy of a relationship you have with the person in the first place. Just because you love them doesn't mean it's not dysfunctional. The addict has to decide for themselves that they want sobriety; no amount of love from another will affect them if they don't want to be sober deep down in their heart of hearts.