Well, they'd already been arguing all day, so they weren't in the best of moods with each other, and then he asked her all these questions about if she loved him and wanted to be his girlfriend etc. when right at that moment it was obvious that she probably felt like she didn't. Then she answered honestly, because that's what she's like, and he sad faced, because that's what he's like.
If you watch it back the rest of the group weren't particularly supportive of Chris in that moment and he does actually admit he was in the wrong and apologised to Liv about it afterwards. I have always thought he was incredibly manipulative and immature - he just managed to make himself look better than Liv because she's a shouter while he turns on the waterworks and plays the victim.
I liked her on Love Island - she could come across as a bit defensive but I think she got a poor edit. Her and Marcel ended up splitting up when he cheated on her, which was ironic considering everyone was convinced she was the one who wasn't being genuine.
However, all her carry on since LI with the dreadful Dan Osbourne, has made me like her considerably less.