Ask him what his plan for you, if he want serious or not.
But you must aware this situation also because you really don’t know if he is serious or not.
I had experience dating online site. All I thought he is serious, he talked to me all the time, almost everyday, called me almost every night. Seeing him in Skype. He support me financially too. We talked more about in future. But one day his friend (girl) message me in Facebook telling that the person I trusted is not single, his a married man. Of course I was shocked. Then at first I didn’t believe him but every time I asked him about his status he got angry. So, I decided to stop. And then he stop sending message in my Facebook too. A month ago, his brother confirmed that his brother was a married man.
So, I told to myself that I don’t trust online people. Much better to look someone who will meet you personally. Don’t waste your time with him,