I definitely think you should start watering less often, and see if that doesn't make a difference. Everything else sounds good in the way you care for it. Feel the weight of the pot when the plant has just been watered. It should stay heavy for at least two days, more likely 4-5 days. When you notice its getting lighter in weight, water it. See how that goes. Don't feel bad--there are plants that many people grow with no problem that I just can't keep alive! Many hoyas don't do well for me, neither does Clivia or African Violets. I kill every one of them. (I have three hoyas now, but they are the only survivors out of at least a dozen). Yes, I would not let my BF sit in water. Try it, and let me know how it goes!
