My partner would sometimes react strongly to a situation and it would catch me off guard. Over time we learnt to talk about it once things calmed down and it helped me better understand her triggers and how i can avoid them.
Little gestures go a long way in a relationship. Bear hugs, a good bye kiss before leaving for work, bringing home a small gift, or snack, etc are seemingly small deeds but have a great positive impact on a relationship.
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.
Sorry isn't the end of anything. If you mean it, it's supposed to be the beginning that leads to a change. So, the next time you find yourself apologizing to your partner, take a moment to reflect on how you can turn that sorry into a catalyst for positive changes in your relationship.
As you grow together, remember to keep doing the things you did the first year you were dating
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.