<human>: Can you summarize the given text in a few sentences?

So the other day, I went out to the bar with a couple friends.  While we are there my friend invites this girl he knows to meet us there.  Apparently they have been hooking up for a little while and he wanted to get some action that night.  After the bar, we all go back to my place and just hang out.  We had all had a couple drinks, but nothing too far.

We get to talking and I ask if anyone would want to hang out and have drinks on my patio the next day (I had a couple different friends coming over and figured why not invite a couple more?).  Everyone says they are busy except the girl.  She says she's free and could swing by when I'm done with work.  My friend doesn't say anything and doesn't give me a stink eye or anything, so figured it was cool.

Next day, I had 3 of my friends over and she comes too.  We end up hanging out until 1AM or so.  The friend who is hooking up with her couldn't come because he was working.

The next day, I got a text from him saying something to the effect of "how were you hanging out with ____ last night?  No more hanging out with my fuckybuddies.  I'm trying to lessen her presence in my life and she is trying to move in on it."  

Obviously I didn't know he was trying to avoid her (he invited her out just the other night).  So I apologize and say it won't happen again, but she had already made plans to hang out with our group again this Sunday.  

Now she just texted me to see if I wanted her to bring anything for Sunday (we were going to barbeque or something).  Is my friend being childish or am I intruding?  I thought that if he didn't want us hanging out with her, he shouldn't have invited her in the first place....
<bot>: Friend has fuckbuddy.  Fuckbuddy hangs out with me and other friends.  Friend gets pissed because he doesn't want her in his life (despite the fact that he is still having sex with her)