I think its fine, and not unhealthy but on the contrary, very healthy, especially if you are having positive feelings.
Enjoy this time.
I've always been a loner,for me it's as natural as breathing.
I still like chatting with people, but like to hang out with a group makes me feel smothered,yeah,I'm weird like that,but that is me.
If this alone time isn't a withdrawal/depression then I wouldn't be concerned,but if you are starting to question it,maybe talking to a mental health professional can benefit you, that is if you aren't feeling comfortable any longer with your "alone time".
Take care now,
DE