<human>: My SO [24 M] and I [21 F] have been together a year and a half. My lease expires in February and I'm looking for a new apartment. I go to a university and he's already graduated and been working. 

Currently he lives with his family in a distant suburb (~45 min drive) from the downtown area of our city. He initially moved back home to save money - he's saving up to go to graduate school in a few years. 

We spend most of our nights together as it is, and we love the arrangement. Sleeping schedules, cooking, and those things you learn about a person just from being around them a lot have not been a problem. We have a healthy, communicative relationship, and he's a wonderful guy that I'd want to marry farther down the road.

My problem: I'd like to ask him to move in with me next year, but I don't know how to ask him, or if it's even appropriate at the time. I'd love for him to be closer to me, and sharing an apartment means he could afford to move out of his parents house and save money for grad school at the same time.

Could you distill the essence of the text into 1-3 sentences?
<bot>: My SO is wonderful, and I'd like to take the next step in our 1.5 yr relationship by asking him to move in with me. How?!