Backstabbing Bestfriend?? (Vent session)

Hi y’all so I need some advice, I was best friends with this girl for 5 years.. I found out her and my boyfriend talked to each other at one point in time when we (me & her) had a fallout. I asked her about it, and she wasn’t truthful until I asked her a year later she finally somewhat told the truth. I forgave her for it, and I was willing to move on but when I had a personal problem in my life she wasn’t there for me when I needed her the most. She said it was awkward from the past situation. But I felt like.. if it should be awkward it should only be awkward to me, yet I wasn’t really feeling the awkwardness towards her I felt it was hurtful she lied about it but I was over it. So I expressed how I felt and tried our friendship out again but we went a couple months without speaking. She became friends with someone that doesn’t like me, and she became friends with an old friend who forced her to do stupid things both of these people she used to complain about to me. She says our friendship was genuine, but now that I’m typing this & thinking I was the only one trying and she was a bs person. I feel so stupid for trying to rekindle a friendship that was never genuine on both sides.