Sorry, no. I wasn’t going to say anything, but now that you are rationalizing that it’s okay because “we are shomer”, I must bring R’ Moshe’s teshuvah, which is a davar pashut, but if you read, you’ll see why he wrote it. Having a boyfriend/girlfriend, unless for the direct and explicit purpose of getting married, is assur even when shomer negiah and yichud.
http://hebrewbooks.org/pdfpager.aspx?req=921&st=&pgnum=115&hilite=