Don’t complain about every small thing that irritates you. Be more accepting and let things be. Your partner is a different human being, so let them be that. Accepting the differences makes the similarities more enjoyable
Most couples avoid having difficult conversations that are necessary to create a life together. Instead, they try to avoid these issues and hope they would work themselves out. However, the truth is that they can't be on the same page without consistent communication.
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.
Pause, breathe, and connect. Your emotions matter so when you are upset about something, take the time to calm down before a discussion with your partner. This helps to identify the core concern, allows for clearer communication and nurtures a loving, respectful dialogue.
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.
Building open, clear and safe channels of communication in your relationship not only removes the stress and distance of guesswork, they also bring in fulfilment, empathy and a real chance of growth. Remember, no matter how well you know your partner, you can't read their mind.