Neil, I'll just tell you like my wife told me.
"If you are spending money on tools and time in the shop, at least I don't have to worry about you spending money on booze and chasing other women at bars!"
Although, you are young, and at that age, most men don't know what they want out of a woman as far as how serious a relationship they want. Don't rush it, trust your judgement, and all will be well!
You are already ahead of the game, you have maturity most 18 year olds won't see for many years.
Smart move keeping your relationship off of FB and between you and her.
Good luck, buddy!!