Should I marry this guy?

It is a simple answer. If you even have to question getting married to this guy, then it is not meant to be. When you find the right person, there will be no questions, you will know. This is one of the biggest decisions you will make in your life, but it should be an easy one when you find that special someone. He may treat you like a queen by buying you flowers but it isn't worth being treated like that.