Anyways I started ignoring him slowly since last month because he has a girlfriend and I didn't want to get involved in all this. I don't know if it's coincidence or not but shortly after that he's become totally uninterested in work and he was very passionate about it, he doesn't seem like himself anymore, mostly comes late to office and leaves early the reason being he keeps drinking during those hours (sometimes he even comes drunk to office and sits nexts to me).
I found out yesterday that he's planning to leave after this month and since I heard this news I feel very sad. I don't know why. What's going on?