<human>: Could you distill the essence of the text into 1-3 sentences?

3 days ago my fiance and partner for 6 years just left me and suddenly started dating another guy 1 day after we break up. She told me she didnt love me and hasn't for a long time, the weird thing was she didnt let of to it. It hit blind sided the hell out of me. 

Come today i find out shes dating her co-worker who i suspected was the man she was now dating. She claims she never cheated and didnt plan on leaving me for him. But i really think its bullshit, i mean she lied to me about loving me for years, how is lying about having a plan so crazy?

Im just venting and im really fucking angry/sad/upset everything.

Also this all comes after i just got on anti-depressant/anti-anxiety and am getting my emotions all in order.
<bot>: Fiance left me after 6 years, told me she didnt love me, and is now dating her co-worker.  How the hell do i deal with this everyone? Im really lost here...