So, My best friend is blowing me off for her boyfriend.?

Maybe about two months ago, my best friend got a boyfriend. I was totally cool with it, and I gave them space and I would do other things and hang out with my other friends until it got to a limit where they piratically go to each other houses everyday, and whenever I would TRY to make plans with her, she'd say "sure!" but maybe a little while later, she'll pretend that I never asked her anything and tell me she's going to her boyfriend's house. So, every time I try and make plans she blows me off, just because her boyfriend says he's coming over. I've talked to her about this before, she just denied it, and said she still needs me there for her. There's really so much I can take before I get up and leave. What do you think about this? :/