Emotional Infidelity...?

[Drew02]

My BF and I live in an area where there isn't a lot of opportunity to interact with other gays. I have some good straight friends, but there are things I can't really talk to them about. So about 6 months ago, I met a guy online at another gay chat/forum and we hit it off almost instantly. We just had this understanding of each other that was pretty amazing. He is also in a long-term, monogamous relationship, and we have no romantic or sexual feelings for each other. It's just that we can talk, about anything and everything, and it's good. The 4 of us met once IRL for a weekend, and by BFs response was a rather tepid, "They seem nice".
At this point, my friend and I chat whenever we're on the forum together, email 3 - 4 times a day and sometimes chat on MSN or chatzy.
The problem is, my BF has started complaining that he thinks I'm too close to my friend and talk to him too much and tell him too many personal things. It's not like I'm taking time away from being with my BF, we often work different shifts so he isn't even home. And I don't talk to my friend INSTEAD of my BF.
My BF is talking about what he calls Emotional Infidelity, which he says is when someone is emotionally intimate with someone outside the relationship.
It doesn't seem fair to me that I have to sacrifice a friendship that I value a lot because my BF is jealous, possessive, and watches too much Dr. Phil.
I love him and I'm try hard to make things between us work, but I don't understand why he feels like he has to be the only person in my life that I'm close to.
Am I wrong about this?