They are, and you know it. But, this particular relationship may not be worth what you’re struggling with now.
First, I want to talk a little about online dating: It’s both a terrible and a wonderful thing. The way you have to juggle potential mates in your head and heart is a terrible thing. They way you can meet spectacular people you wouldn’t otherwise meet is a wonderful thing.
There are so many possibilities for what’s going on. Someone upthread mentioned how this guy could be trapped in one of those situations where he’s “dating” someone else, but either that relationship isn’t moving forward or something is wrong with it, and then you come along, and he likes you and things start moving, only he’s got part of himself committed to someone else, even if it’s just a sense of loyalty for a relationship that’s a bit older. I’m not claiming that is what has happened, but it could easily be. Why do I think so? Because I ended up in the same situation myself.
I got over a thousand replies to an internet singles ad I put online in 1996. A handful of those replies led to talking on the phone and meeting in person. I fell in love. Oh, well, fine. It was more like falling deeply in like, with a guy from Connecticut. I liked everything about him. He was perfect and I wanted him. I knew I wanted him and I wasn’t going to stop wanting him! He started drifting away, and I met someone else one weekend when I really felt like hell. The someone else? So not for me! Sure he was funny and smart and all, but he wasn’t The Guy. Sure, I met him and he was amazing and he was the best hugger in the world, but he wasn’t The One. And when I told The One that I had met this Other Guy, The One sounded kinda glum, but maybe kinda relieved, too? But no! He couldn’t sound relieved because he was The One and this Other Guy was just a guy and not The One and the hugs and the conversation and the laughter and the love I was getting from the Other Guy just couldn’t make up for the fact that he wasn’t The One and The One was drifting and drifting and drifting and then, of course, I married the Other Guy because I was completely in love with him and invited The One to the wedding. 
And, at the same time, I discovered that I was The One for someone else entirely, who was despondent that I was drifting and drifting and drifting and then, after a couple of months, I got invited to his wedding, too.
Seriously, I can’t claim that’s what’s going on, but the way internet romances start sometimes leads to this sort of desperate tap-dancing around and through emotional mine-fields. Things we don’t intend to happen can happen, such as falling in like with someone when we already have a sort of half-assed, purely in our own heads commitment to someone else, and there is much guilt and the only thing we can do is wait to see how it all turns up.
As an equivalent, say you met someone else and he’s pretty special and you talk and you’re attracted, and then this first guy calls. Imagine how torn you’d feel. He might be, possibly, potentially, in a similar boat.
On the other hand, he might be a weiner.