My guy friend gets a new girlfriend every week?

One of my closest guy friends is always getting new girlfriends. Literally every time I talk to him he has a new one. Just in the past 5 days he's had 2. I don't consider them to be real relationships, but he does. As far as I know, nothing sexual is going on, and he's a virgin.

He says he envies me and my boyfriend's relationship, which we've been dating for a little over 8 months, but yet he doesn't value relationships with any of these girls?

Have you experienced anything similar?

And what do I tell him, because I can't deal with this anymore.
My guy friend gets a new girlfriend every week?
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