It was his bday. He wanted to have a party and invite everyone he knows. It doesnt mean hes close to any of them or that there gonna be flirting with him. If you trust someone then you shouldnt care who else is there as long as its not an ex or as long as he doesnt have loads of really close female friends that he talks to more than you or spends time alone with-then there shouldnt be an issue..
You need to accept some responsibility here. Your behaviour was out of order. You dont know how to communicate. You try to read his mind and make assumptions and expect him to be able to read yours. Just coz hes your bf doesnt mean hes supposed to understabd every thought and feeling you have or that he should be able to pick up on subtle hints or mixed messages. Hes not a mind reader.
Heres how i would have handled it: i would have told him i dont do the whole dating/sleeping with others so i expect full exclusivity and trust. Are you okay with that or should we go or separate ways now? If he says yes "okay great, the only thing i expect from you is full honesty and trust and ill give you the same"
Next: that phone conversation.
Me: am i invited
Him: yes all my female friends will be there
Me: okay, is it okay if i bring a friend with me?
Him: yes.. thats fine
Me: great see you there.
If i felt after meeting these friends that the friendships were innappropriate-id break up with him
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