Is this guy shady and maybe I'm the "other woman"?HELP!!?

Is this guy shady and maybe dating more than me?HELP!!?

Ok. I met this guy in January and went out sporadically like 3 or 4 times. Then didn't see him for 3 months because he was busy like he said going on vacation and with family-weird.
So he invited me over last night and ate take out and then watched a movie. All of a sudden a girl knocks on his door and he opens the door and for a few seconds he is whispering something to her in their language.
She was actually very pretty/hot and dressed in gorgeous clothes but did not look smiley or happy.
He got weird when she came in-he came back and sat on the couch in awkward silence and asked, "did you leave me a message on my phone?"
and she said, "I called and you're not picking up," in an annoyed way.

He stayed silent on the couch an ddidn't look at me. She came closer to the living room staring at us surprised, annoyed, and confused, and kind of put her hand out as if saying, "WTF is going on here? and who are you?" We were not sitting together-he layed on the couch not saying a word and I was on the floor. Actually I felt intimidated-she looked good and professional but sexy looking up at her from the floor I was sitting on. He is a lawyer so it made me think that the way she looked she might be important.

I felt embarassed and felt like this was his gf or some other woman he dates and said, " I'm leaving you two alone." Then she said sarcastically, "No, I'll leave YOU TWO alone." NOt mean or anything.

I left and didn't even say goodbye.

Is this shady?? Should I believe him if he tells me it's a nobody? or does he sound like a player or maybe this was his gf???
I mean he hadn't bothere to ask to hang out in months and now this????


AND, he didn't even stop me from leaving. Just said a lame, "bye Jenny."

Oh, and she looked pretty comfortable in the place too. She really was not about to leave, but as if she expected me to go.