Agree with all those who say she couldn't possibly have known that this would be the end result, and to suggest that she was somehow Machiavellian or sophisticated enough to think it would be smacks very much of 'look what she made him do.'
We're talking about very young adults here, who haven't been living away from home for very long, who are sexually unsophisticated and just figuring things out and making a lot of mistakes along the way. I can well remember in my first couple of years at uni that there were lots and lots of sexual encounters that weren't good in all sorts of different ways. These are people with very little sexual experience. Many with none at all, beyond whatever porn they have been watching. It's not just learning the act itself, it's learning how to deal with the aftermath. And we all talked about it. Everyone wanted to know who had done what and with whom. We thought that made us adults, but we were also immature and stupid. Girls would talk about which boys were a safe bet for casual sex and which ones weren't, who didn't wash enough, who was crap, who would give oral sex and who wouldn't, who was weird and to be avoided. It's a very intense time and emotions run very high. There's a lot of drama over things that older people would deal with quietly and privately. But nothing is really private any more thanks to social media.
It's known, I think, that oxbridge unis have their own social rules that seem odd to an outsider. To kids at those unis, who have spent their lives being told how clever they are, who's parents have often invested a lot of money in getting them there and have very high expectations, they seem very important. But I don't think it was just about being ostracised. This is a young man who had been publicly shamed for being sexually inappropriate. Everyone in his social circle knew. That's a lot for a young man to figure out how to deal with, regardless of what actually happened. There's lots of information out there about dealing with being a victim of sexual assault, but there's not a lot for young men having to deal with the realisation that they may well be a perpetrator of it. There were boys when I was at uni who had that reputation and you never left a friend alone with them, especially not if there was alcohol around. They usually moved on to a new friendship group who didn't know or sometimes transferred to a different uni or took a year out.
It is a horrible situation for all involved, but happens quite often, it's just that the end isn't usually this tragic.