Well said. OP, I would caution you to be very careful following any advice you read on r/relationships. This sub has a well earned reputation for bitterness. The group will always default to no contact/ditch them/move on/they're terrible people. Every. Single. Time. And anybody who offers a different opinion will be downvoted and/or called an idiot. There is no gray here and there is no such thing as forgiveness here.

I hope you decide to give your sisters a chance. Of course I would advocate being cautious and taking it slow, but this being a plot to abuse you sounds crazy to me too. This is a sad story and I don't think it necessarily has to end that way.

Good luck