Whether warranted or not, it's only natural to become frustrated when you feel as though you're not being understood, or perhaps even heard.
[Something about this reminds her of Sougo, and how he admitted only recently to Lacus that he pushes others away because he wanted to test them, see if they're worth him risking his feelings. Or Helix, and how he has trouble trusting people and diverts their attention with his attitude.]
It sounds as though he was uncomfortable with discussing the way things are between you. It reminds me of some people I've gotten to know here. It can be a little difficult to see past the walls they put between themselves and others, sometimes.