Hopper's love life was definitely hinted at in the first and second seasons.
First, we saw his daughter, Sara, have a panic attack. Later in that same episode, we see another flashback, and she is in the ICU, where she eventually died.
You probably didn't notice, (because, quite frankly, who would), but Sara is wearing a blue elastic in her pigtails in one of the flashback scenes.
Hopper is wearing it on his wrist.
Hopper is seen wearing the elastic band, again as a bracelet in episode five, season one.
Eleven can be spotted wearing it on HER wrist on her special night at the Snowball, in season two.
Especially since he considers Eleven to be his daughter, and has now legally adopted her.
We think not.