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It depends on what you mean by “changed”. If you were mean to them, apologize, if you ignored them, apologize.
If you know what you did wrong, you have to tell them you know what you did and you’re sorry.
Show them you still want to be friends. Treat them to ice cream or something if they are willing to hang out with you.
But they might not be ready to hang out with you just yet. If this is the case, still apologize and let them know you’ll be there when they’re ready because they’re friendship is important to you.
Hopefully they come around eventually.

It’s important not to avoid them from the get-go. At least let them know you’re sorry and you’re willing to start over

Then wait for now. See if they decide to come back. But don’t try and force them. You must have really hurt them if they aren’t jumping back into a friendship with you. Understand that they need time to heal and time apart for a while.
Let it take its course. If they decide they don’t want to be friends again, respect that. But I have a feeling if it’s a close friendship they’ll forgive you.
But be prepared for any outcome

Can I ask a question? You don’t have to answer if you don’t like…was it worth it?

I’m sorry to hear that. If I were in your situation and I was trying to recover from all of this, I would try and let my friends know how much they mean to me and I would try and avoid letting this happen again.
We are only human. People don’t realize what they are doing sometimes until it’s too late. But we can’t beat ourselves up for it.

Well I’m glad you apologized. Now it’s up to your friends if they want to forgive you.
Think about how you would feel if one of your friends betrayed you for a guy.