If you were having a 3am heart to heart conversation with someone you had been dating for 3 or 4 months in which you asked them if they thought you were attractive and this was their response, what would you think?
Why would someone date someone and introduce them to their friends etc if they thought this?
I'm used to being told I'm not pretty enough or could lose a bit of weight by men I've dated but these are usually implied. No one has ever been that direct before.
At the time, I didn't know what to think. I just thought, "Well, at least he's honest," and, although it upset me, I didn't end it straight away. I think I just appreciated the honesty 
We dated for a few more months but the comment never left me. I just felt really uncomfortable that that was how he saw me and so I started to withdraw from him emotionally and physically and, in the end, I was just miserable and dumped him. The final straw was when he once, and for the first and only time, told me I looked 'really pretty' when i was ill and exhausted and objectively looked the worst he'd ever seen me. It just felt like a cruel joke.
On reflection, I don't think he was being honest. I think I put him on the spot by asking him. I think he didn't want to lie by saying, "Yes," I think he didn't want to be unkind and say, "No," so I think he gave an obviously untrue exaggerated response in order to avoid answering honestly.