I have a similar if not the same issue. I can't say that I have found a solution but I have a method I try to test; that method being to "try". I'm not saying "just do it!" When people have to learn skills like these that are too complicated to map out and logically approach they just try, the successful ones at least. The major reason that children learn languages better than adults is not because of neuroplasticity, its because children don't care if they get something wrong, they just try. So as long as you are doing something that looks a bit like what you want, you'll get closer to doing what you want. At least closer than if you didn't try at all. If you feel that you are trying as best you can and it's not working. Maybe make stuff up. Say that you love someone because of the odd way they smile even if that isn't entirely true or you aren't really sure how you feel about their smile (maybe tell your partner that you are doing this). If all else fails or just because you want to some social/expression counselling might help (not that I know of any).
Best wishes,
Fish
13.09.2020 by User57330L14
My marriage lasted 32 years. Looking back I think we were both Alexithymic so a reasonable match.