Halloween 😳

So my bf has a best friend he's known since he was little. Her name is Kay. I know they have absolutely no feelings towards eachother so i have no problem spending time together. I have no problem with them being alone. I'm not jealous of her. I trust her. She pretends to be close to me but she seldom invites me out. The bf and I had problems and she told me she didn't want us back together so she deleted my number from his phone and she texted me that I was his back up cus it didn't work with someone else. So she wasn't very for us being together again. So she stopped talking to me after that. She must've blocked me cus none of my messages deliver and I don't see her on my snapchat story any more. So I see her parents all the time at work and they both love me and they're telling me how busy she is and how they miss me but like I can't contact her. So my boyfriend said she's having a Halloween party and her dad asked him to come and he said he would. I wasn't invited. So I'm spending tonight at a block party. He asked me to go with but I don't wanna show up and cause problems and have her be fake cus it's clear she doesn't want me there. But like I wanted to spend tonight with him. But he said he's obligated to go. He has class till 9 and then he's going to her party so by the time he's done there, it'll be too late to spend any time together. And my best friend pointed out that Halloween is a mandatory date night but like he chose spending time with someone else over me. and we've always had a problem of this but like he has gotten better but this is an example of why we couldn't get along before.  Because I have no priority. Hell always put his friends first over me. I'm thinking I should start doing the same :/ but that's not my nature. Idk maybe he needs to miss me in order to wake up.