Hi Amelia,
Sometimes people that you meet on dating sites disappear after days or even weeks of great communication.
Remember that they are using a dating site. Meaning, there is a good chance that they are talking to other romantic prospects as well.
Sometimes, they just come to a point where they believe that they have a better connection with someone else and choose to focus their attention on that person.
This doesn’t mean that there is something wrong with you. It is just that they felt a better connection with someone else.
It’s best to avoid initiating further messages to him. Let him be. Make sure that you are talking to other romantic prospects on the dating site as well.
If he comes to a point where he feels that he would like to reconnect with you, you will hear from him. But, don’t sit around waiting.
You are better off taking advantage of what the dating site has to offer in terms of potential partners, than waiting around on a guy who may never show up again.