For what it's worth, I personally believe attachment is a good thing except for instances when you're attachment is with someone who is sick. When something bad happens to my friends or relatives, I'm sad for them and it does have an influence on my mood. I call this compassion. But when my husband is actively drinking his moods go 100 miles an hour and I can't keep up. It is maddening.
This morning my husband said some really, really nice things to me and it made my heart swell a little bit and then I thought 'uh oh, I'm not supposed to allow him to affect me.' However, this is good stuff but it's with someone who is still sick. So, I'm a little torn here.
I'm not applying the principle of detachment to my life, only in my interactions with my husband.