My boyfriend was interested in playing, so I created an alt just to level with him and show him around. 2 years later, he helps me out in raids and sidequests. I've since deleted the alt, and I just adjust my main to whatever job he decides he wants to try out. If he goes dps - I go healer or tank & so on. It also helps that we also got lucky, and found a great FC that helps him out when I'm not online.

I think it works best when you let the S.O. find their own way of enjoying the game.