I agree about finding a way to meet. Agree, the moods could be from a variety of things, interacting in person could explain, you'd see body language.
Arguing is a concern, if it's going beyond a more friendly disagreement or one that's heartfelt and expressing needs in a productive attempt at relationship growth.
Seeing how the other behaves in person, seeing the eye contact and body language that goes with voice pitch, seeing what distracts and brings about 'quiet time', and all those important nuances.
Relationships are a big investment of heart, time, and energy.