Am I overreacting? Friend "ditched" me at party.

Anonymous
My former best friend is now in a serious relationship, lately we barely text, barely meet up, ...we don't really hear each other anymore. She doesn't really ask me to hang out anymore, maybe once, maximum twice a month. I totally understand the fact that she wants to spend some time with her boyfriend, a lot of time, but I feel ditched. I usually ask her to hang out, she usually says "no, my boyfriend...". Just like yesterday. She asked me if I had something planned, she wanted to hang out but she had to ask her boyfriend first. So that last part gave me jitters but OK. We decided to go to this party, me, her and her boyfriend. At the beginning everything was OK, then a friend of hers (who can't stand me and I can't stand her) came to talk to her so I turned around and talked to other people. Then I turned around and I didn't see her anymore, I waited half an hour, standing there by myself, trying to have fun and dance, after half an hour I still didn't see her. So I went home and texted her that I'm home and I would pick up my stuff with her tomorrow (I left some clothes there and I wanted to pick them up today), now I was prepared for a range of answers: disappointed, upset, mad, sad, ... But she didn't even reply. I don't really know how to feel about this, I came home last night crying because it hurts getting ditched by someone you felt was your best friend...
Updates
+1 y
She came by to give me my stuff back, she asked me where I went last night and then she talked about what she did when I was gone, never asked if I was OK or upset or anything.
Am I overreacting? Friend "ditched" me at party.
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