<human>: Colleague confessed love and proposed to me 3 times, including wanting me to meet his parents, have his kids and all, when drunk. I like him back and told him so. The complication - he's in the middle of a divorce and is sleeping with another girl in a different department. He also says that sex is just one component. I don't know what he means by that. 
Sober, he says he's over his head with his divorce and getting his assets together and that he can't start anything. He says that he's not happy with her and they fight but she's also been good and kind to him and that they are friends. He also admitted what he said when drunk was mostly true but shouldn't have been said at that time. I don't know what to think about that too. 
Anyway I've felt like I can't sit he re and watch them have a secret relationship as it kills me. I went away for a while and came back feeling better but feelings rush back when I saw him.
I tried to be happy but only outwardly. He's not sharing anymore of his life with me anymore since we've had our sober talk (4 days?), and I miss it so much and feel so awkward. I tried to shrug it off but I saw him pick her up today and I felt so sad. 
I don't know what to think of this mess. On one hand, I really miss the friendship, on the other hand pretending to be happy like that and go around work happy is killing me inside. I don't think that I should be under any illusions that anything positive is going to come out of it, but my heart hopes. 
I think I should cut off contact with him. Reading some of the posts here, I felt like maybe I'm wrong to cut off everything as it seems like some people here felt like they have been cheated by someone pretending to be a friend who actually has vested interest. So I don't know if I should? 
If I do want to cut off contact, how should I do it? We work together and even sit opposite each other. I can't not see or talk to him. We already stopped texting and use no social media.

Could you distill the essence of the text into 1-3 sentences?
<bot>: Colleague and I have feelings for each other but I want to get over him. Please help with advice and encouragement as I have to see him at work