Guys, what does it mean if a guy friend doesn't tell you they have a girlfriend?

Its still a relatively new relationship he is in... I've noticed he has been kinda cold to me, and isn't as close to me anymore.. or our other friends. But today I found out he has a new girlfriend. He has only told mostly all our friends but me?

I know that we kinda did have a romantic past and had feelings for each other. But that was September, and we "broke up" stopped seeing each other in November. We were even good friends for about a month.. and even described our relationship as "right love, wrong time".
Guys, what does it mean if a guy friend doesn't tell you they have a girlfriend?
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