I sent a blessing message to my friend in the New Year, but I didn't reply.

First of all, you all have your own families. We should be excused if you send him a blessing and he doesn't return. But under normal circumstances, he should reply to the message, because this is the minimum respect for people, so don't contact for a long time. Personally, I think he should be worried. Maybe he's afraid of falling in love with you deeply. In this case, he is afraid of family breakdown and wants to adopt.