Hi all, thanks for browsing by new!

I am looking for (healthy) coping mechanisms for misreading emotions, as this is the biggest conflict source in my otherwise good relationship with my fiancé. 
The thing is, that I misread emotions by dramatizing them, not by entirely switching up. This was caused by a very toxic (previous) relationship of mine, where my ex (most likely) had an antisocial disorder, and he did not really show any emotion, nor talked about it hence I was conditioned to vibe to every single, smallest details of his actions. 
This lead up to me being hyperaware of the other person's (I mean just my SO) non-verbal signs eg. tone changes, really small face and eye movements and how he positions himself. 
And oh boy, how I fuck it up...usually by mixing tiredness and paying attention™ to something else than me. 

I've been told about this by him too, and during Rorsach and MMPI the paranoia showed its signs. This has helped a lot in basic, non-stressful situations (like when he arrives home from work after a 12 hr shift), but still persist in stressful ones. A few for example:
We have an 9 month old baby, who does not tend to be sick/colicky a lot, but today/last night he cried awfully lot, and I've heard that it's his stomach hurting, maybe being gassy. He was holding and consoling him, and demanded (thats how I felt, later he said he asked) me to give him medication A, while I tought med B would be better, but I wasnt sure if it has spoiled or not, so I was hesitating. My SO hurried me, which I felt as an insult, and that he's mad. This or variations of this happens when our baby is fussy, and we are both stressed.
(And an other issue is that I can't get a grasp of reality of overall emotions. We usually discuss these miscommunications later, and he is *very* good with words. (Hes a politican, so checks out) I mean I tell him I felt that he is/was irritated, then he says he wasnt at all. Or when I say it felt bad when he questioned my skills to console the baby, he says that the LO preferred being carried in hand rather than being tried to breastfed. And in the end I just dont know whats valid, if he says this to mask the reality or if its true)

Do you have any experience and best practice to cope with this?

TLDR: I misread every small movement of my SO and think that he is mad at me and cant figure out whats the truth.