Is my boyfriend in love with his girl bestfriend?

I have been in a relationship for 10 years. My SO has a female best friend that I can only count a handful of times she has been around. When my SO invites her to hang out with us together there is always an excuse to why she cannot make it, however, when we are broken up she is readily available to hang out with him. I pointed out this fact to him and we actually got into many arguments. I called her a B$$ch out of anger and sent a message to her and my SO demanded I apologize. I feel I should not have to being as though she has not made herself present in my life or that of my children. I have never given him and ultimatum and I’ve always tried not to interfere in the friendship due to them being friends well before we were even together. I feel like my SO purposefully keeps us a part and he even divulges information about our relationship and my personal struggles to her. I confronted him about his attachment to her and he came back questioning his attachment to me. I know the answer is obvious. He gets really upset if I make any negative comments about her or her absence.

Is my boyfriend in love with his girl bestfriend?
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