Tess: The only one who can erase Chloe's existence is Chloe.
Oliver: Come on now, Tess. Don't underestimate yourself. Although, I do have to say,
I thought the e-mail was a touch much. Touching?

Tess (reading the Dear John e-mail): Oliver, this might be difficult
for you to face, but... I didn't write this. We both know Chloe did.

a touch much = a little bit excessive

eg a touch expensive = a little bit expensive

Thanks, Clive!