No, if you dont trust em, then the relationship is doomed. It doesnt matter either way.

Would you be angry if your S/O hired a P.I. to spy on you?

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The Drinkin' Bone's connected to the Party Bone...
The Party Bone's connected to the Stayin'-Out-All-Night-Long...
She won't think it's funny and I'll wind up all alone...
And The Lonely Bone's connected to The Drinkin' Bone.