Introverts need extroverts. That’s a simple fact. If he’s not going to come around and profess his interest in you, then sadly you’re going to have to take the reins this time.
If you’re the sort of person who wants to initiate then you can’t ask me what his intentions are. You need to ask him what his intentions are. Otherwise his replying to texts could either be an expression of interest or his just being polite.
So basically what I’m saying here is that you shouldn’t be gauging the potential for this relationship on texting behavior. Ask him out for a drink and see what transpires. He says yes, you win. He says no, then you can move on and stop wondering.