UMG - Problems with MultilineTextBox and EditableTextBox

So my aim is to take the text from an EditableTextBox (hereto referred as ETB) and plug the text into a MultilineTextBox (MTB). The ETB fires an OnTextCommited event. The text is then taken from the ETB and plugged into the MTB. I then set ETB’s text to nothing and give it focus. The problem is that setting the ETB’s text to nothing seems to fire off another OnTextCommited event, thus setting MTB’s text to nothing. If I do not set ETB’s text to nothing, then the text will show up in the MTB. Ideally, I’d like to just add text to the MTB instead of replace everything, but I didn’t see any functionality to do that. Maybe someone knows of another way? Here is a screenshot of my graph: