Yes, but he doesn't know them personally. (/s but not because it's untrue)

The NDP is very-much a pro- worker party. When the liberals forced the workers into arbitration instead of allowing them to strike, they cut at one of the core issues for the NDP. The liberals committed their act against the railworkers in public, so the response being in public makes sense.

It would be the same as an environmental party publicly cutting ties with a "pro business" party for allowing the creation of new farm land by reducing the size of a national park.

Also, I can see from the NDP perspective, the view that the Liberals weren't holding up their part of the deal to advance NDP policy. In this circumstance, it's not like quitting a job. Trudeau wasn't Singh's boss. They had an agreement that the NDP said was mutable from the start based on their discretion. For Trudeau to bellyache about it all now is, I think, a bit silly, considering the essentially cost-free benefit his party gained from the agreement for years.

Why Trudeau wasn’t his boss.

Really? The labour party backed out of a deal after the other party busts a big union strike. Anyone could've seen it coming. I doubt Singh felt a phone call was warranted when the libs did something so antithetical to their core principles. It goes against everything the NDP was founded on.

This is politics from both parties. Singh didn't say anything first because the conditions were pretty clear, and it's politically advantageous to strike first. Trudeau talks about being the aggrieved party because that's politically advantageous, too.

That's not the easiest thing when you're a narcissist politician.