Think my bf has feelings for his gbf

So me and my bf have been together for a year. He has a lot of friends that are girls. I don’t really have any guy friends unless they are gay. Honestly ofc I get jealous but it’s something I’ve accepted and I love his friends especially the specific one I’m worried about. He seems much more attentive to her, more happy around her, to the point at times I don’t feel as included. He reassures me but it’s a gut feeling and I never really thought about it too much until this weekend when I just realized his mannerisms. He reassures that he loves me and I have communicated this to him, but I can’t shake the feeling especially when I see how he behaves around her, he isn’t flirty in particular but much happier and more focused on her. I can feel the chemistry, like that feeling when you just know. He lives with her for school among other roommates. I’m less jealous now almost like it’s subsided but moreso heart broken. I want to be with him, he’s a great guy and I love him. But he seems less relaxed and more withdrawn with me. I don’t wanna stay in a relationship that makes me feel like that. I don’t wanna leave either. When I’ve discussed this with him he became very hurt and I could tell he did feel bad. Regardless of his love for me I know there are still romantic feelings there for her. I want to give it time but I also know I deserve better than this. Another reason that I am sure of the feelings he has for her is because his reactions and mannerisms are different than his other female friends. I just feel out of luck. My heart hurts, I feel heavy and quite frankly less than. I could never and would never ask him to cut ties, that’s just plain wrong. I just feel stuck.