I was just about to write a post when I went over to read This and That. To my surprise, there was a similar post there echoing my thoughts exactly! I had a similar experience when I was dating.
Because I was staying up late to chat online (what was I thinking?!) and getting up early on weekends to purportedly help exercise, I was suffering from lack of sleep and thus, my skin suffered. I did not realise it until a couple of weeks after I started seeing M (remember the Monkey?)
Within the 2-3 months that I was seeing M, my skin was a mess. It was dry and pimply and I was dark and my skin was rough. Once I stopped seeing him, my skin texture evened itself out and I now actually look better than I did when I was going out with M!
I guess your skin knows better than you do if someone is right for you. If someone is right, you glow. If someone isn’t, you really suck!