If it were you (Arrow spoilers)

I would understand it I think, like you said someone was betraying the team, another was lying to the team, hell Diggle lied to the team, Felicity lied to the team, giving each other space in keeping their secrets has bit them in the arse so many times, so it's really childish of them to assume the "were a team you should trust us" attitude.

Also they "spied" on them briefly, it's not like they have been watching them for weeks or anything, I mean from what the showed they tracked their phones gps and when something looked out of place they checked local cctv, which just makes the team look worse, the show does this a lot by giving characters potential valid points but fucking up in putting that across.

The only one who I could see having a point is Curtis because he was their friend long before a team mate, he got a spot because of that friendship, Dinah & Rene on the other hand got spots out of the blue, Rene's proven himself repeatedly to be a terrible choice maker, anytime he makes one he fucks up almost, Dinah got recruited amidst a revenge fuelled killing spree iirc in memory of the guy who turns out is alive and a murderous lunatic, so again judgement in question.

What made me laugh is Curtis saying he's still going to work with Felicity because yeah that makes sense, I mean it's not like you just had a pop at her for being overbearing, selfish and controlling as a business partner, now you learn she doesn't trust you fully and willingly "spied" on you...oh yeah that's the person I want to build a company with, dear god.