Should I be upset or am I being too sensitive?

So my bff of 22 years has been with her bf for about a yr now. Whenever I'm out with my bf I've invited her to come over so we can meet him and just get to know him , but mainly so I can hang out with her. She goes MIA when she's in a relationship.

Anyway, she always has an excuse. She never brings him around. So now almost a yr since they've been dating our bestie is coming into town.. she wrote to her in a group message that her boyfriend wants to meet her and she's so happy she'll be in town. Over emphasized that he wants to meet her asap and they'll drive to where ever she is staying .

Well I couldn't help to feel left out. I'm so many occasions I've invited her over so we can meet him and she's declined. And she didn't invite me to join them or said she wants me to meet him.

Why does it bug me so much?