My ex, when drinking drives himself bonkers with alcohol thinking. There's, imo, a level of black out, which results in imagined slights as occurring. Plus, I question how it takes him to not so great life moments of his past, that involve alcohol. His mom, was a drinker, and that must have been very difficult of an experience.
Sooooo, trying to sooth his fears, may actually be far beyond any amount of control(not to be confused with trying to control) you may have.
Meaning, none of these fears will change unless he realizes he needs to change.
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