If he is emailing less, he is losing interest.
This often happens in internet dating.
You could be emailing back and forth with someone and everything seems to be going well, only to have the person start emailing you less all of a sudden.
It often happens due to a loss of interest that is caused by boredom and distraction.
When internet dating, people are often distracted by messages that they are receiving from other people.
In essence, there are other people that they are most likely communicating with simultaneously.
If he is finding himself more drawn to the conversations that is having with another person that he is messaging with, he may start decreasing the effort that he is putting out in messaging you.
You should decide whether you should leave him alone based on how you feel that your interaction was going.
If it felt like it was really going well and you were really connecting with him, it may be best to work on improving the messages that you send, instead of leaving him alone and giving up.
Again, it is likely that he has started emailing less because there is someone else that he was messaging simultaneously that is winning over his interest.
Being that he started his interaction with you with more enthusiasm and excitement, there was clearly something about you that drew him to you.
Think back to what he would often say about you in your earlier conversations.
He was most likely giving you more compliments back then and telling you about particular qualities that you had that he really liked in you.
Go back to those conversations in your mind or look them up if you still have a history of them in your message inbox.
There is a chance that he may have started emailing you less because you are no longer someone that he is able to relate to.
For example, when you were both chatting in your earlier conversations, he may have made several comments about how he loves the fact that the both of you have so much in common.
This may have been something that kept him really excited to chat with you on the internet dating site for some time.
However, your interaction may have eventually reached the point where he felt as though he was no longer able to connect with you.
He was no longer feeling that commonality.
Perhaps you got too comfortable going off on a tangent about different topics that he simply couldn’t relate to.
You may have even fallen into the temptation of sticking to talking about a handful of topics that he may have been initially excited about, but now he is bored with.
These are possibilities that you can look into.
In order to reignite his excitement, you may have to start finding ways to connect with him again by using your commonalities.
This means that you need to find something that you both have in common that you are yet to talk to him about.
This may help to remind him about why he was excited to talk to you in the first place.
It may be best to try this first before deciding whether you should leave him alone or not.
Being that there was a lot of initial excitement when the both of you first started communicating, there is a chance that you can reignite it.
To do so, it would be best to find something new that you know the both of you have in common and message him in relation to that.
This may get him to start emailing you more, due to rekindled energy.