It doesn't sound like you have anything to worry about. If you two are already thinking about getting married, that's probably romantic enough for him. Now the thing to do is to get to know each other better. In my country a lot of people go to their church and the minister counsels them about marriage and if the couple go together it's like a class. There are other types of counselors that do the same thing, but I don't know your culture at all, so I don't know if you have pre-marriage counseling there, but I'm pretty sure that all the Catholic churches offer something like that. Not that I'm advocating for the Catholic faith. That's your own preference and choice, and I am not Catholic. What it does is show the couple what the things about being married are that they don't know. Marriage is a complex thing and you're young. Spending your time learning about it since you don't see your boyfriend during the week can help you spend some of your time in a constructive way. Then on the weekends you can talk with your boyfriend and learn more about him and yourself. I'm sure there are books on this subject you could read, but I don't know which ones are good and which are bad.
If you want him to be happy in the long run working on having a good marriage is a good way. It isn't all about romance, as you will learn. It's a lot about work and responsibility and sharing.