I've been talking to this guy for a few months, we've known each other for many years but randomly started talking and both got feelings for each other. He has expressed so much interest in me in the past few months, but he would be messaging me all day and night for a few weeks then he would go MIA for several days and then come back, or he'd read messages and not get back for days. I recently found out he might have an alcohol problem, is it common for an alcoholic to disappear for days and come back like nothing happened? or is he not into me?