If this is the guy that you love, I'd say get married. I see lots of issues arise in relationships when people live together because they always have an "out" in the back of their mind. Things will get hard as relationships have ups and downs--especially when you live together and have to deal with the quirks and different preferences. For me, the commitment of marriage has seen me through some tough spots--as emotions can sometimes take over (and in a negative way). Clear, consistent, communication and laying a foundation of agreement for how to handle conflicts is helpful, too. Each couple is unique so each needs to find their own way to love each other, respect each other, and to know where they can bend and what will make them break. Best to you!