Emma's behavior (spoilers)
She says she loves her boyfriend and the relationship has progressed to the point where they have talked about marriage. She supposedly loves him but acts immature on the spring break holiday. She didn't look all that drunk or drugged when flirting and dancing erotically with a guy or even when taking her top off. She mimicked sex and an orgasm knowing it was being filmed because there was a camera right in front of her. She obviously had her senses about her because she told her boyfriend that she went topless one night with others.
Her boyfriend notices a change in her attitude when she returns. Although she says she loves him, she wants him to move away with her to another city which would probably mean him having to quit his job as a fireman.
Her boyfriend gets wind of the video and doesn't answer her calls or emails. He finally calls and questions her. She says she didn't do any movie but doesn't explain her behavior on the trip any further. He says get can't do this and hangs up. After watching the video herself, she calls her dad and tells him about the video but says she says she didn't do anything which is a lie, she did take her top off and did mimic and fake an orgasm for the camera. She never calls her boyfriend to try to explain her behavior on the trip and that it wasn't her in the video doing those things. So obviously her feeling for her boyfriend weren't that strong.
Days pass and after her father's business is torched she goes to the scene distraught. Her boyfriend is at the fire and shows her a poster of her found at the scene. She goes to him and hugs him. He holds her head in his hands and kisses her head. The next day, he comes the her parent's house to see her dad. She sees him and the first thing she has to says to him is "sure you want to be here?" And then acts kind of snotty towards him about what happened at the fire saying that last night was pretty emotional but you don't want to get stuck just because you rescued some poster.
She then accuses him of not being around when she needed him. She says that she has been through hell but nobody protected her. Although she said that she didn't know what she would do with somebody she loved, she certainly didn't show any sympathy for his feelings about her in the video. In the whole scene, she was condescending towards him.
He stands up for himself telling her that they are not back yet and he doesn't know if they are going to get there. He says they can talk about her feeling unprotected but there is a lot of other stuff, like her not wanting to marry him and the idea she wanted to explore other options. She takes excepting claiming she never said that. He asks her why she didn't tell him everything that happened on the trip. He then offers to help. Just as he offered to help, I would have probably done the same considering his previous feelings for her but that would have been the extent of it. I would never take her back. She didn't treat him very well and never had the same feelings for him as he had for her otherwise she would never have allowed herself to be in the position she found herself in.
She even teases him saying with smile that he's afraid that she might have done everything in the video. She says that when he's trying to help her! Give me a break! She's a real piece of work.