Most unhealthy relationships are caused by not paying attention; I so much love the statement that says, "Listen more than you talk."
If you want to build a good and enjoyable relationship, listen more to your partner and appreciate them. Setting healthy boundaries, too, is a good thing, but you have to be mindful of your partner; some partners want to stick close to you always, so it is left for you to explain yourself. If not, you are also putting your relationship in jeopardy.