I'd say he likes you. He walked you out rather than just saying goodnight at the door, he rested his head on yours, arm around your waist; he's trying to maintain as much body contact as possible.
The text messages are nothing. In person, I can talk with a girl I really like for hours on end, but ask me to text or phone and I send the shortest possible message. Some of us guys just don't like phones and aren't comfortable communicating on them in a social setting (either talking or texting). Typical guy mentality with the phone works like this: call - make plan - hang up. That's it. There's no chit-chat, no old times, nothing. We can do that in person.
I'm sure you're correct in the thought that he's wondering what the deal with your ex really is. That sort of situation would make most men hesitant. Once your ex is completely gone, then I'm sure things will progress more smoothly.
So don't worry about the phone. In person, he shows all the signs of liking you (as more than a friend). Go ahead; make his day.
- sorry. After your comment about mocking cheesy action movie lines, I just couldn't resist.