I agree that each of us needs to own up to our faults and responsibilities. But you also have to think about whether you are taking on too much, to an unhealthy degree, i.e., you are "enabling" another person's unhealthy habit.
Me: 50, MLC/WW 45 Young kids Nov 2015: BD1 Apr 2016: BD2 Jan 2017: W filed Feb 2017: D final