A Transport Workers Union vice president is facing a union trial Friday on claims he improperly tried to discipline a bus driver for allegedly cheating on his wife — who also drives a bus — with yet another MTA bus driver , according to records obtained by The Post.

His alleged attempt to untangle the messy love triangle at the Fresh Pond bus depot in Ridgewood, Queens, was a case of no good deed goes unpunished, TWU Local 100 VP John Paul Patafio said, according to the union proceeding documents.

Patafio called on Gary Archibald, a bus driver and TWU Local100 vice chairman at the Fresh Pond depot, to stop cheating on his wife, Canisha Catin Mitchell, with another driver, Loshana Welcome, records show. 4

Patafio said he intervened at the behest of Archibald’s wife — who, as a d

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