Don't know what to do

I've never really cared about how I've taken care of rings/jewelry before. My boyfriend of nearly 3.5 years bought me this and I just want to make sure I take care of it properly. I've put a clear coat of polish over it, I've heard that is supposed to help, but I'm still worried it'll get ruined. See, we have sulfur water and sulfur water tends to tarnish things quickly. I would just take it off when need to shower or wash my hands, but the problem is it's in the air too. I also have to get my hands wet and a little soapy to take it off if I want to. It goes on really easily but is hard to take off, I'm assuming it's because of my knuckles or the loose skin on them.

Sorry for rambling, help? Also it said it was Sterling silver, but it doesn't have number inside it so I'm pretty sure it's fake. Which is fine because it was pretty cheap so I wasn't expecting much