I’m receiving my friends FaceTime calls.

About a month ago I got a text from a random number I didn’t have in my contacts. It was asking for my friend. I had told him he had the wrong number and gave him my friends number, he didn’t text me again. Honestly I think that part wasn’t just an accident but lately I’ve been receiving FaceTimes from him (my friends friend) and I answer telling him it’s me and not the friend he was trying to call and he tells me that my contact is set up as her name. I blow it off thinking he accidentally set my contact as him name. However he FaceTimes again a few days later but it only rings once and I didn’t have the chance to answer and let him know “Hey, it’s me again. You should probably change my contact name.” I wanted to see if he ended the call or I unintentionally declined the call so I went into the FaceTime app. The Tect below his number reads “FaceTime answered on another device” and I get really confused. I thought maybe my mom had answered it but it was 2 am (she’s always in bed by at least 10 pm) and I never heard any ringing. So I text my friend and ask her if she’s FaceTiming the friend that had accidentally texted and FaceTimed me, and it turns out she was! I’ve never given her my Apple ID and my FaceTime is set up so I can only receive calls through my phone number. Please help!! It’s getting super irritating.