How do I deal with my narcissistic boyfriend truly wanting to leave me for my bestfriend?

So my boyfriend I think wants to leave me for my ex best friend. He literally treats me like garbage now because of her & doesn’t see any harm in his actions. He’s trying to kick me out 2 days before my birthday. I’m trying not to be hurt by it, but his actions towards me have been horrible.

How do I deal with my narcissistic boyfriend truly wanting to leave me for my bestfriend?
Post Opinion