Every relationships do have their own challenges and issues , different people coming together to be in a relationship , different people with different personalities coming from a different background..
This makes each person to have their own mentality towards life and how they handle their relationships , what you considered to be a "not so serious issue" might be what your partner might feel its a big issue , and what your partner thinks is not a issue might be an issue to you..
That is why we need to understand the importance of communication in a relationship , we need to be willing to communicate with each other in the relationships , we should be willing to listen to each other and discuss whatever issues we are having in the relationship..
When we communicate with each other , it makes it possible for us to sort out the issues in the relationship and it will make the relationship to become successful...
We also need to be willing to compromise in a relationship , we should avoid doing things we know that our partner do not want from us , the habits your partner do not like or want , you can compromise by simply stopping those habits and avoiding them...