<human>: My one buddy has been with this same girl for over 6 years now. The girl hes dating has this sister (Samantha). Recently Samantha has been texting me to hang out and asking me all kinds of personal questions. Over the past week I've been going to her place and just hanging out, watching movies and just getting to know her better. She's been throwing out some pretty strong signals, but something about it just didn't feel "right" to me, something just felt off about her, like she was hiding something. 

This morning her sister (my friend) found out I've been hanging out with her more and sent me a long text. It was basically saying how Samantha has had a long-time boyfriend for years now, and is planning on marrying the dude. I guess he comes up once or twice a month to visit her and takes care of all her financial needs.

I guess what I'm asking here is I should probably confront her about this right? I mean even if she's alright with a "friends with benefits" situation, it would still be kinda greasy, seeing as her boyfriend thinks it's a monogamous relationship.

Can you give me the gist of the text in a nutshell?
<bot>: Started hanging out with this girl for a bit. She kept her long-term boyfriend a secret and wants to hook up with me.