Is she attention seeker??

I met John 5+ years ago from basketball and we are close friends. He had a crush on Brittany who plays as well. But she was in a long term relationship 7+ years. She lead him on. Brit's bf found out it and quickly proposed, now they married.

Ive known Brittany through John and basketball we all play. She works on planes and when travels she helps us bring back bball equipment. Shes helped me numerous times and me and my gf also treate her to dinner too.

During the summer I introduced Alex to Brittany. Alex knows John from before and we all play bball which is cool. This was 3-4 months ago.

Fast forward to yesterday, Alex came to town. My other friend said he was with John, which was cool as I was busy with GF. Today, I was talking to coworker whos Brittanys friend too and said she met Alex and they were all at Brittnays bday dinner. I wasnt invited or even heard of it?

My gf thinks Brittany seeks male attention cause of her marriage. It may be true as I wouldve brought my gf along if i was invited. Alex is single too.

What do you guys/girls think?