Is He Just Bored Or Really Interested In Me?

Few months ago there is a guy asked my phone number on the street.
He walked pass by me, turned back to stopped me ,,Hey you are beautiful, can you give me your number?,, it was the first sentence from his mouth. He was not joking, looking nervous. We talked a bit on the street. I gave him my number.
We text-ed for 2 weeks then he lost his phone,
one day he text-ed me with new number ,,I lost my phone, who is it?,, I ignored it. Then he found me in Facebook. (I checked his Facebook, he seems pretty normal, even his grandfather was in his Facebook, have normal friends. Seems not like stalker, weirdo…etc)
Then we dated two times. It was fun but I didn’t find him very attractive.
Then I got busy. He kept asking me to come out to drink with him but I had no time.
Now he is visiting his friend in another country for 4 weeks. He”s sending me facebook messages about once in a week and I don’t understand it.
He is not asking me a question or asking me how I am doing.
He sends me like “so you like that huh?” “your new pic is so hot!”
I don’t know how to answer him.
Does he like me or is it just a meaningless message? I mean it’s weird that he is sending me just about once a week when I’m almost going to forget about him.
What does he want?
Does it mean something if a guy keeps sending a private messages for any special reason?