AITA if I insist to celebrate my friend’s birthday?

She is quite an introvert and prefers staying at home, but I love hanging out. I usually asked her out maybe 1-2 times a month

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But things changed a bit after she started a relationship with her boyfriend. She usually spent weekends and holidays with him. I asked to join them; sometimes she refused, so I could now only hang out with her maybe once every 2 months.

Also, I felt like she has been saying ‘no’ to me more. For example, she doesn’t like horror movies, and she doesn’t like alcohol. If I asked her to watch horror movies / go to the pub with me, she used to agree although she didn’t want to. Now she just told me she didn’t want to watch/drink. I felt she has been disrespecting me, and she seems to value her boyfriend more than me.

Soon will be her birthday; I want to celebrate for her. I want to give her a surprise, so I contact her boyfriend. However, he didn’t reply to me directly; he showed the messages to my friend and told my friend to respond. My friend said she didn’t want a celebration, or having lunch together would be enough.

Then I told her I want to celebrate with her; I already marked my schedule, so she must spend the whole day in my place. Later she told me she had to work that day (but it’s Saturday), so she could only have a quick lunch. I suspect it’s just an excuse.

AITA if I point out she was lying and insist on my birthday plan for her??