My sister disowned me

Im 20 and i have my baby daddy from 6 years. One night i had girls night with some friends and my baby daddy had his guys night out with his friends my sister was actually dating one of his friends and they all hung out him his 2 guy friends and my sister. We were all really close once😢 that night for whatever stupid reason my baby daddy grabbed my sisters leg several times while they were in the back seat with friends, she took his hand off and that ended at that, the next day my sister told me everything she was crying because she said she felt betrayed because he was like a brother to her i was crying and i was feeling like shit. I couldn’t believe my boyfriend had done that, this happened 5 months ago and my sister and me talked alot of things out and were doing good, i worked things out with my baby daddy i never once justified his actions they were horrible and selfish I don’t trust him the same but I definitely wanted to give my little family a 2nd chance because he seemed genuinely sorry for what bad happened. We took a beach trip with all my family and everything was fine this was a couple weeks ago... well today out of no where my sister starts telling me she hates me and that im a bitch and a bad mother and that i chose my boyfriend over her she said he raped her and that i chose him, i was in shock and so confused rape? Wtf when did this happen, I thought woah wtf did my boyfriend rape her? Well to come to find out she was talking about that night when he touched her leg she said him touching her leg was rape i told her that wasn’t exactly what rape was and she got furious she said she never wanted to see me again and she completely cut me off now. Im so sad because i love my sister but also my boyfriend i feel guilty for giving him another chance now, i always wanted my sister to be in my life but she has different plans what do you guys think😔