It seems that all the way into Season 7, Ser Jorah Mormont still doesn't have a lot going on in his life aside from pining away after Dany, otherwise known as the Dragon Queen. So why is Jorah looking for Daenerys on Game of Thrones? The obvious answer would be that he's still in love with her, believes in her right to rule the Seven Kingdoms, and wants to help in any way he can. Unfortunately for Jorah, afflicted as he is with Greyscale, he doesn't seem to be in any position to help anyone right now.
Ser Jorah made his rather unexpected reappearance in Episode 1 of Season 7, in what appears to be a quarantined cell in the Citadel at Oldtown. Poor Samwell Tarly probably did not imagine he'd be cleaning as much human waste in the Citadel as he does, but it did allow for his chance encounter with Ser Jorah. As Sam attempted to remove a food bowl from a cell window, an arm suddenly thrusts forward, covered in the scales that are a telltale sign of the normally fatal disease, which is like Westeros' version of leprosy. The familiar voice of Jorah Mormont asked if "she's here", referring to the Dragon Queen. Sam stuttered that he hasn't heard anything.
If you've forgotten the whole history with Ser Jorah, he was banished by Daenerys when she learned that he was once a spy for Varys. But Ser Jorah is in love with Dany, so in an attempt to get back in her good graces, he captured Tyrion and brought him to her, contracting Greyscale in the process. Eventually, after saving her life a couple of times, Dany forgave Ser Jorah, and ordered him to find a cure for his disease and then return to her. From the looks of things, his search for the cure is not going as well as it could be. The Greyscale has now climbed all the way up his arm, and he is locked in a solitary cell in the Citadel, where he presumably journeyed to find a cure or some treatment.
Jorah clearly does not know that Dany has just landed in Dragonstone, the place of her birth, which is also coincidentally sitting atop a mountain of dragonglass, the one thing that can actually kill a White Walker. Having just discovered this very important bit of information, Sam has rushed a message to Jon, which may very well bring him to Dragonstone, thus finally bringing about the meeting between Dany and Jon that fans have been waiting so long to see. The only question left is, where will this leave Ser Jorah? And does he know more than he's letting on? Only time will tell.