I reject my best friend after she got a boyfriend

I was talking to my best friend and she said, "Let's go on a trip together." I ended up responding, "You already have a boyfriend, so go with him." After that, she stopped talking to me and when I sent her a message, she didn’t reply, as if she no longer cared about me. I didn’t mean to make her think I didn’t want to hang out with her anymore, but in the end, she did exactly what I said went with her boyfriend. Later, I found out that her boyfriend is poor and can’t take her to eat good food or travel to beautiful places, and all he can do is tell her he loves her every day. I feel really sad. They've been together for a year, but there’s no future. I don’t dare to warn her. I think she deserves someone better, but I’m afraid she’ll hate me.

What should I do?🥲 Ignored her forever or pull her up again?

Btw, I’ve always been there for her to help but when it came to my problems, she didn’t care and just gave a half-hearted reply like "So what?" That made me choose to tell her to go on the trip with her boyfriend because I was angry that she seemed to care more about him more than me.