<human>: My sister and I are somewhat close. We both are living at home for uni, she just finished up her freshman year while I just finished up my junior year. We talk a lot and share many of the same interests, but when it comes to emotional/deep things we never really talk about them. My whole family is like this—choosing to ignore difficult subjects instead of talking about them directly. Admittedly I'm like this as well, but I'm trying to get better.

For the past few months I keep hearing my sister cry in her room. In the past I've had no idea what to do and just didn't do anything. Other times,  I've knocked on her door and asked if everything was okay, only to be met with "yes" and "I'm okay." All of her answers are short and just her stonewalling me. I still don't know what to do. I've asked her if she wants to talk, she said no, I've told her she needs to get help, she kind of agreed but didn't do anything about it.

I think she cries because she is lonely. She has never had a boyfriend and really wants one, but can't seem to get one. I wish she could just embrace the single lifestyle but for some reason she can't be content. She also doesn't have many friends and I think that gets to her too. If I had any friends I would invite her along to things, but I don't really have any (I am okay with this.) I hang out with her a good bit anyways but I guess it's not enough.

Besides offering to listen to her, what else can I do? She really needs therapy I think but I can't force her to go. The only solution I can think of is telling our parents about her crying (they don't know) but she's eighteen and I know she'd hate me if I went to them. Should I? Is that the right thing to do? I'm at a loss here.

What should I do when I hear her crying?

Any advice would be greatly appreciated.

Can you give me the gist of the text in a nutshell?
<bot>: My sister keeps crying at night in her room. I've asked her if she needs help but she always says no and pushes me away. I don't know what to do now.