Look, you don't need to take my drastic all-or-nothing route (because how else would you share your #glutenfree meal photos?) But in the instance that you do unfortunately suffer a breakup, I guarantee you’ll be happy with any preventative measures taken to not draw attention to it on the internet.
Other people can't run their mouths
When you publish private matters for all to see, you’re giving your followers the opportunity to form (and voice) opinions about your relationship. Your Auntie Joan is retired, so she'll spend a few hours perusing your boyfriend’s profile after you tagged him in a photo. Then she'll call, advising you to dump him because he looked like a player in 2009.
Then there's Ashley, a girl from high school with whom you haven't spoken in years. She'll comment on one of your couple photos, "Aw, you guys look SO happy!" Then she'll screenshot the pic and send it to Becca with the caption, "Wasn't she JUST dating someone else two months ago??" And Becca happens to have loose lips and works with your boyfriend’s brother... you get the idea. I'm not saying you should care what other people say. But why even give them the opportunity to say anything at all?