He is hoping to meet more dating prospects.
He may be at a point in his life where he wants to keep his dating options open and meet as many dating prospects as he can.
Though the both of you have been dating, he may not want to put all of his hopes on romance on you.
To some extent, he may want to know what else is out there.
Though he may enjoy his time with you, there may be a part of him that wonders about who else is out there and what that person can do for them romantically.
In other words, he may wonder whether there is someone else out there that can get him really triggered and excited about getting into a serious relationship.
He may have joined a dating site with that particular desire in mind.
He may want to really get taken by surprise by someone.
He may want to really feel what it is like to be really set on someone romantically.
He may not be getting that kind of heart pounding excitement from you.
Again, he may enjoy his time with you, but he may not be getting that romantic ebullience of feelings for you that he may be craving.
He may be hoping that he finds this in someone by joining a dating site.
The guy that you are dating may have just joined a dating site because there may be something that he just experienced with you that turned him off.
He may have been perfectly complacent with dating you and may not have been thinking about joining a dating site until recently.
There may have been something that you said or did that made him hesitate and worry about his relationship with you.
Think back to some of your most recent interactions.
There may have been a moment where he seemed unhappy about something that you said or did.
This may have been the moment where he realized that his relationship with you may not be as perfect as he had initially thought.
This moment may have been what led him to start thinking about joining a dating site.
He may have put off joining a dating site for a little longer because he just wanted to be sure about his feelings.
However, those uncomfortable feelings persisted and as a result he eventually found himself joining a dating site.
He may be worried that this issue will never improve.
Hence, he may have joined a dating site in the hopes that he can find someone who doesn’t have this issue.
Until he finds that person, he may continue dating you just so that he has someone around.
After all, there are still other qualities about you that he likes.
However, this one issue is such a deal breaker for him that he simply can’t ignore it and act as though the relationship is perfectly fine.
The guy that you are dating may have just joined a dating site because he may not be entirely sure about where you want your interaction with him to go.
In other words, he may not be aware of what your true motives are for the relationship.
He may worry that you will lose interest in him at some point and move on to date other guys.
He doesn’t want to find himself in a position at some point in the future where he has mentally committed to you, in the hopes that his relationship with you will lead to a serious relationship, only to have you tell him that you are moving on.
Hence, to protect himself, he may have joined a dating site.
He may reckon that it is best to expose himself to other dating potentials so as not to allow himself to become too emotionally invested in his relationship with you.
This way, if you were to suddenly tell him that you are done with your relationship with him, he wouldn’t be left emotionally devastated and blindsided.