I don't know whats happening?

What do you do if your feeling pushed out but nobody actually notices it?
So my boyfriend is usually great, he always talks to me and makes sure I'm included, but thats only part of the time. The rest of the time whenever his friend is around, he totally ignored me and is completely focused on her. I don't even think they realise it.
Whenever she's there he goes from being really tired to happy and full of energy, and sometimes the way they look at each other, you wouldn't think they're just friends.
Its really starting to get to me but I don't know how to talk to him about it, cuz the last time I tried to about the knocking he was completely used to it and said its fine and I needed to relax.
Slowly just feeling like I'm drifting away.
I don't know anymore.
Help
I don't know whats happening?
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