I don't know if this is symptom of BPD but anyone has it? I need help how to cope with this.

Friend is talking &amp; working with a person I hate and I seriously start to lose all trust and everything I have to him. (my friend)

I don't know why this feeling but I want to cut/leave everything with him. I want to be again alone, working on my own. 

This feeling sucks. Idk what to do. I feel so much weird about the situation and everything. I have some sort of sadness and anger, have none to talk about and I can't seems to process it. I know my friend for more than 2 years and he seems loyal but i dont know :( This sucks.

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Ideas? thank you.