People in a relationship don't flirt with others. If they do, it means they are unhappy and looking for something else
I realised over time that not all conversations are meant to be discussed logically, some are purely emotional e.g my partner feeling jealous when i speak with a girl is an emotion and I shouldn't try to explain it logically. This change made things so much easier for me.
Over time and after quite a few conflicts, I realized an important thing - I should keep the conversation focused on the issue at hand and not criticize my partner at the core of their character. That’s the difference between complaint and criticism.
I used to body-shame my partner by saying something negative about her height, looks, etc. But then I realized that I wasn’t having fun with her, but instead at her cost and it started to impact her mental health. I immediately apologized to her and stopped.
Before speaking with my partner about what's bothering me, I usually let him know what I hope to get from the conversation. e.g "I just want to be heard", or, "I want your inputs on something and love for us to problem solve together", etc.
Whenever she would do something that I didn't like, I would immediately go to a negative place. Over time I learnt to ask myself - What are other possibilities that may be more positive than what i am thinking? Assume she was trying to help. Asked myself the question - What’s another possibility?