Your Messenger message:

"Good evening sir Tony!

"I hope my message does not cause much of a disturbance to your evening. "I've been getting strange feelings and heightened anxiety lately and I cannot seem to discern if this is caused by overthinking or that these are signs from the universe. "I practice tarot reading, and there is a question I'd like to ask: "1. Can a reading be influenced by my emotions? "I came up with this question because I have been doing readings and have been getting downloads of information that my boyfriend is doing something behind my back. "Will I be able to use tarot to confirm this? "Thank you for your time sir Tony!"

My reply:

Hello _____!

The truth in Tarot card readings, like that in psychological projective techniques and dream analysis, is, for the most part, intuitive rather than factual.

Yes, readings are affected by your emotional state--as the movements of the pendulum also are--unless you are a master at suspending feelings. 

There are many, logical ways to confirm whether your boyfriend is doing something behind your back.