I admire you for wanting to report it!! Something similar happened to me, he did it twice (it was my first time and I dissociated), and I’ve just forced myself to accept that I won’t report it (I didn’t want to risk my family finding out, we’re religious). And I essentially denied it for months and continued seeing him until he did it again, and then 2 more months and I ended it... finally confronted him over a year later (this month in fact) and I even used the r word to his face and I didn’t cry!!! Albeit I sobbed all the way home..

I would say the messages would be enough evidence for the college as he’s even confessed to it- but might need a little bit more backing if it’s reported to the authorities. He deserves to go down or at least bare some consequences and shame.