@Har722,
Har, you don't say what Industry you work in, curious because you also state you are lonely.
Lonliness comes from not being happy with your own company, being around family, friends, hobbies, gym, things. "Missing him" as he does not live with you and you rarely see him, is a different story than being lonely.
I worked in Management in Restaurants for 17 years, hard to get out of once there, a shirt load of responsibilities but also a lot of interaction with a lot of people and usually late nights as you try to unwind with staff, or locals.
It's a completely different life and you don't get much time to feel "lonely". But you don't get much chance to enjoy a proper relationship either.
If he is 27 and a GM, he will not let that go, that's a good position, rewarding financially and an important job. Even if he moved in with you, you will rarely see him unless you are in the same industry and make it a point of being there at the end of work, on-going.
I think the question really is, regardless of who lives where, is can you live with someone who will spend all of his life in the Hospitality Industry?