I’m the 4th wheel in my friend group

And it sucks. They have been best friends for a very long time and in middle school they ditched me to be with each other and being with them now is like living in a flashback. They always talk about memories the 3 of them share and especially one of them because she dislike me. I’m good friends with the other 2 but when the other one is with us I get left out. She ignores my texts and just looks at me when i talk to her and barely gives me an answer. When we hang out it’s like I just disappear for them and they all forget that I’m there. I hate when they make plans for all 4 of us because I know that they don’t really care if I’m there or not.