Parenting a teenage boy!! HELP

First off I want to say I have an 18 year old daughter. She was the best kid, never any issues with her. Easiest teenager ever!!

I also have a 15 year old son. He’s a great kid! A/B student... But he’s still a teenaged boy. Here’s what happened.....

He had a GF and her and her family bust up over here at our house to set things straight. Apparently their daughter snuck out, rode a bicycle here (8 freakin Miles) and my son allowed her to come in through his window. They ended up having sex (first time for both of them). My son did not know she was coming over with a condom in her pocket, they both admitted to this, but he took advantage of the situation once she showed up at his window.

I’m so disappointed in him but i don’t know the “right” way to punish him.

They are no longer allowed to communicate in any way as this was her parents wishes. They also wanted him to quit the basketball team because she’s a cheerleader. He agree to but we are not letting that happen!

I’m just at a loss on how to deal with this one! 😭

UPDATE 1: Oh my, thank y’all so much. I do feel like while we were all having a discussion everything was being put on my son. Even my husband and I put most of the blame on him. BUT after letting it all sink in and having time to process everything we apologize to him. We told him he is still in the wrong and should have manned up when he seen her at his window. He is in more trouble for sneaking and lying than if he would have come to me and asked me to bring her back home. We took his phone and I went through every bit of it. Deleted her from everything. I have to know his passwords at all time. We gave it back only because we pick him up from practice and he needs to get in touch to let us know when. He doesn’t start driving himself until early next year. He will only be allowed to drive to school and practices.

Also, we are a pretty open family. We have talked about sex for over a year now. I told him I’m mostly upset about him allowing a girl into our home and lying. I’m disappointed about the sex but my husband and I were teens and understand. We started dating when I was 16 and married when I was 17.