<human>: Can you condense the text into a few key points?

We've been together 3.5 years. We live together and have plans for the future together. I'm female, 22

He (24) made a new friend. She's nice. But she's in another country.

I admit I worried a bit. I asked about her, but trusted him. He said she fancied him, but he rejected her advances.

Well. I went to use his PC to look for jobs. There was a conversation open with her. He discussed everything I had said about her to her. He implied I must be attracted to her. I don't know her so how can I be? They agreed I was weird and fucked up.

He admitted in this conversation that he wanted to be with her, but it would "wreck" me.

He then made me join in playing games with her online this evening.

Before I knew all this, I thought it was ok. Just a bit awkward because it was people I didn't know.

And now I feel humiliated.

I don't know what to do.

I forgot to mention, he also discussed having her stay at our flat. He said to me it would be a chance for her to get away because she's having a tough time. I read that she actually suggested it, and I can imagine it would be a lot less innocent.
<bot>: My boyfriend has been talking to this girl, told her he wants her, wants her to stay with us, and humiliated me in front of her (online)