Loneliness is more of a symptom than a cause. Rooted in the unhappiness they feel in the MR. I've never heard a spouse, regardless of their childhood, saying hey are "lonely" within a happy, healthy MR. So no, I don't think it has to be addressed, I think it is naturally alleviated as the R unfolds.
The unhappiness they feel in the MR is more a symptom than a cause. IMO As long there is no abuse, each partner is responsible for much of their own happiness.
M 53 W 54, M since 98 D15, D19 8/2013 discovered EA, W maintained contact with OM until 10/14 7/2/17 W said she wanted S, 7/25/17 moved out of MBR 12/17 W says moving out 5/18, W still in home.
