Why isn't he trying harder to keep up the convo when he's the one who likes me?

This guy has been trying to talk to me for the last year and it's never worked out because I've been skeptical of him because he can be a player, but recently we talked about it and he told be that he wants a real girlfriend- someone he can trust and who won't screw him over like the other people he's dated. I've known him for a while and he's serious and he wouldn't try to pull something on me because he knows I won't take any of that. So I decided to give him a chance, but when he texts me, he never contributes to the conversation and gives short answers, and I just end up not responding because I feel like I'm wasting my time. Since he's the one who has been trying to talk to me, I thought he would at least put a little more effort in since I'm finally giving him a chance. What's going on?
Why isn't he trying harder to keep up the convo when he's the one who likes me?
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