He didn’t really disappear — he just went back to the status quo. 😳 If a guy wants to date you, you’ll know because he’ll ask you out, take you out, and show you a good time. Since you initiated the coffee date, you didn’t get the benefit of knowing he wanted to date you by waiting to see if he’d ask you out. And when he turned down coffee — but invited you to his room — it was an easy way for him to hang out without making any kind of commitment. I can’t tell from your post if the two of you had sex or not, but it sounds like although you had a nice time together, it wasn’t nice enough for him to want to take the lead and date you. 😕
This may change, but for now, I think you should flirt with him when you see him, but let him be the one to take the lead so you’re not confused or disappointed. 😉 And play the field so you’re not overly focused on someone you want to ask you out, but isn’t. It’s like watching water boil — but more disappointing. 😕