If you are only meeting once a week after a year of dating, then you are dating and NOT in an exclusive relationship. If you were exclusive, your guy would be looking to spend MORE time with you and initiate MORE communication with you. Therefore, you can take your cue from his level of personal contact and know that you are dating him and should look to date other men as well. If including this man in your decision to “play the field” doesn’t feel right after a year of dating, then stop seeing him and focus your attention on your life and other people. He does not seem interested in taking this dating situation to the next level, so either accept that and date other people besides him or move on completely and leave him to SMS with his female coworker.