He seemed very attatched to me. We were together all of the time or texting every day. I never got the sense that he was losing interest in me (except for his very low sex drive). We never got in a single argument or had any discussion about compatibility issues. When he broke up with me over the phone, he said it was because of my life problems (I didn't realize that I had any, LOL)
He was always very very chatty(keeping me up all night with his talking), fidgety, and nervous looking. I figured he was just kind of weird. There were a few times that he slept all day, including when I took him to meet my parents. He occasionally missed work by sleeping through his alarms. He was moody and sweaty (he said he was just naturally sweaty). He consumed an inhuman amout of weed and alcohol every day just to sleep. I occasionally saw him with dark circles under his eyes. I noticed him scratching a lot and sometimes picking, but I never saw any scabs or sores. And his tooth grinding caused him to need a mouth guard (he blamed it on large quantities of Modafinil, which he was also taking).
I never saw any physical evidence, but at the time never would have known what to look for. He was generally pretty sharp and functional and reliable. When I went to hang out with him after our breakup, he looked happier than ever, he had complelely cleaned his apartment (for the first time ever) and his eyes looked like an owl (he said he took ecstasy).
It could be that he simply wasn't into me, but I'm suspecting that he was secretly still using, and not telling me because I told him that would be a dealbreaker. What do you think?