What should I think about his behaviour?

A year? Dear, time is precious. Do like ... NEEEEXXXXXTTTT. Don't waste your precious youth waiting for someone who does not value you enough to take out of his time to share it with you. Repeat "reciprocated love comes to me easily and effortlessly". Believe it, and it will come true for you. It has to. You will attract what you focus on. Continue focusing your efforts on guys like these and you'll get more of those and that's what you don't want. Good luck.