Please respond quick

I would get ahead of it all and file a complaint of some sort. You are going to need some sort of support to get through this. you don't have to deal with this alone, ok?

Some schools are required to provide “supportive measures” to students, with or without a formal complaint. That might include providing counseling and changing class schedules to avoid sharing a classroom with the accused involved. That might help with the classes issue.

I would keep screenshots of the inappropriate stuff he said. Also watch your phone very closely, because one of them might try to steal it and cause trouble for you.

Don't just tell your friend what he did; show her the evidence on your phone.

As harsh as this may seem, you might need to tell your friend that for your own well being and safety, you can't be with her while she is involved with him. Tell her that if ever she's in trouble or pain she can still contact you via email for a listening ear. And tell her that if they ever break up, you'll be happy to renew the friendship. She won't like it and may feel betrayed.

I think it's important to set up clear and effective boundaries to stop bullies.
If the school has a counsellor, it would be a good idea to report the details of the bullying to him or her. Putting it in writing and showing the proof on your phone would be a good idea. She/he will also be able to give advice and perhaps help via a direct intervention of some sort.
I think it's best to go to school and attend all the usual classes, but during breaks try to find somewhere private where you can relax with someone you trust, or perhaps reading anything you enjoy in the library.

I know it seems really big right now and I am so sorry you are having to go through this but try to breath through it and make decisions as logically as you can. Don’t let him chase you away from school. That’s supposed to be neutral ground. Don’t give it up.
Make sure an adult who has your best interest at heart knows what’s going on. It’s embarrassing to talk about but speaking as someone who lost a friend to suicide in high school, be brave and speak to an adult who cares. I know it sucks to be reminded but we have lived more and seen more. Benefit from the experience of the adults around you. Believe me, they work for that experience. They’ll have an idea of what to do with the harassment from there. I’d definitely block the guy.
As for the friend, these guys are by and large unable to hide their nature for long. Let her know how you are handling the situation and that although you don’t like her being with him, you’re always there for her. Caution her that abusers tend to chase those that care for us out of our lives asap. If after seeing your support and friendship, she still thinks you’re lying and wants you out of her life, back off. She either isn’t truly your friend or she’ll come around when she needs you.

U should have show her the text u was getting

Let her date him. There’s not much you can do about it.
Lots of girls think they can change a guys bad behavior.

Messaged you

Ignore it

I would tell someone in authority cause they sound rape-ish.