My sister’s boyfriend emotionally cheated on her with me? I told my sister and she doesn’t want to be with him anymore? Why is he apologizing now?

Walamagicc
Okay so about a month ago, me, my ex and my sister were all on a 3 way call because my ex blocked me and I needed to contact him to get my computer back. He started privately texting me and then he sent me some pictures of his dick and videos and then he asked me if I wanted sex. Also asked me if his dick was bigger than my ex? And he also asked me to send him nudes. I don't know why I didn’t send the screenshots to my sister when it very first happened but I told her all this went down in December. At first she didn’t believe me, I got a new phone a week later, gave my old phone to my aunt so I had to clear off my old phone in order for her to use it. My sister and her boyfriend have been together for almost 4 years and I have only met the guy once about a year and a half ago but he never looked at me in a sexual way so him hitting on me after a break up was even more baffling!

Okay so yesterday I texted my sister at work and sent the screenshots of something he sent me that was inappropriate to say. I’m not going to say what he said because it’s too disturbing but long story shots, he lied to my sister and said he never sexted with me. Also my sister is older that me by like 6 years and her boyfriend is like 28 and my sister thought it was creepy that her boyfriend would emotionally cheat on her with her baby sister (me) and I called her last night and she told me sorry for not believing in me at first.

And her boyfriend called at like 5 this morning but I kind of recognized his number but I of course ignored his phone call because I feel violated and I feel guilty even tho I didn’t do anything wrong. I feel guilty because me saying that cause my sister to break up with him and he still wants to be with her even tho he cheated on my sister with me and then he texted me and sent me an apology but I never opened his text message and quite frankly, I don’t want to.
Updates
+1 y
It was actually a 4 way call not 3 way
My sister’s boyfriend emotionally cheated on her with me? I told my sister and she doesn’t want to be with him anymore? Why is he apologizing now?
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