Second option for my bf

We’ve been together for almost 2 years. We make plans sometimes just for an “us” day to hang out all day and have fun, and EVERY time someone interferes with it & makes plans with him, he chooses then over me. No matter how long weve planned it out for, he chooses the other person. I feel like I mean nothing to him and I’ve told him this and he says he will stop but then he does it every time. Should I just leave :( I feel so unwelcome there and I sontwant to feel that way with my boyfriend 😞