I think the text "I can't wait to work with you tomorrow, I miss my Dan time!sounds like something id text a gay friend of mine "can you stop by work just for 5 minutes so i can see you?" could be my gay friends responce. Lol You should totally ask her how she feels about "dan" and maybe you'll get one of these two answers "hes a great friend" " a fun friend of mind dont feel threatened by him hes gay". Whatever the case may be,if you feel as if this is a lil too friendly,(which i would feel if he was not gay)then you should let that be known.Communication is key dont assume. Hope everything works out well.( trust is earned so dont think you have trust issues,if you just was angry for any lil text or just accused her of cheating and so on then maybe you would have some type of issue)