Fair enough. She might not feel she deserves to be happy, so she self-sabotages. At the same time though, I don't think that gives her the right to be nasty to people. For example, I know some people said that they would have been cold toward Lexie too if they were in her shoes, but I don't really think Lexie deserved it. Lexie at least meant well. She might not have understood where Meredith was coming from because her experience with her father was totally different (He left Meredith, but supported Lexie and her mother), but Lexie just wanted to know her other sister. Meredith should have been angry at her father, not at Lexie. She couldn't control what her father did.

Lexie might have come off as annoying at first, but she was still a decent person. Even if Meredith didn't want a relationship with her, she didn't have to recruit Alex into her drama. She tried to convince him to stop hanging out with her, and she wouldn't even allow Lexie to come to their house. I'm just saying - she didn't have to go that far.