doki-doki

friday night's gathering of both japanese teachers and alt's was a strange blend of 'justine at work' and 'regular justine'. yahara sensei, one of the japanese english teachers i teach with at toyoura, was at this enkai. several drinks into the night (that is, everybody), i sat down next to him and started chatting. his alcohol induced state allowed him to speak much more freely than he does at school, and we ended up having a really nice conversation.
he told me that when he sees me at school, he thinks i am so lonely because everyone is too shy to talk to me. he says that he feels so sad for me, but that he is too worried to talk with me because he is "shy boy". japanese people have several really cute expressions which consist of saying one word twice, and fast. one such example of this is 'doki-doki' (said while thumping one's heart). it basically means your heart is beating fast (because you are nervous, or, more likely, because something has 'touched you'). so he said "i see justine sensei sitting at her desk, and my heart goes doki-doki, and i feel so sad". i laughed and said i am completely fine at work (usually msning one of you guys). so then we promised we'd talk more at work and that we are now 'tomodachi' (friends).
watashi-tashi ima wa tomodachi desu. is this right?