How to know if Aries man is SERIOUS.

A little history before hand -

Me:
Sun: Taurus.
Moon: Aquarius
Rising Aries

Him:
Sun: Aries
Moon: Gemini
Rising: Libra

I've been dating aries man for a year and a half now. We initially met online, talked on the phone for hours on end every single day for six months (then we finally met in person). I know him really well and I'm madly in love with him, however, being in a long distance relationship has its bumps in the road. I've been thinking of moving out there because he hasn't made initiative on moving where I am (we live across the country from one another).

Problem is -
Is he serious? He's not very responsible when it comes to preparing for a career (he's working part time) or even saving up money for our own apartment. I'm 100% motivated and serious, however, if I take the initiative - is he going to follow along and be responsible as well or use and abuse me in the long run? How can I tell if this man is truly serious? By the way, he's 25 years old, and still lives with his parents. He's done with college and I think he just needs a boost out into the real world, but he's the youngest (very baby'd by his mother), It's a struggle to take him serious and look at him as a keeper if he hasn't flown out of the nest (yet)?

tell me about it!! i agree - usually very immature at that age, but when do they grow up? how am i able to motivate him and better yet, do i want to? guys, what are signs that an aries man is serious about a relationship?