Do you not know how much I hate empty profiles? It shows that you are not here for study and growth, but instead to fulfill your own need, and could abandon your account with a whim, if you do not find what you are seeking.
You sound only paranoid. And if you have spent 3 years on this relationship already and only now come to question it, I think you have already wasted your time and are growing restless. You are paranoid!
This is not a dating site, but I can give you helpful tips:
-Your partner considers his phone very personal and will not allow you free access without him reviewing it (to make sure his messages are well hidden)
-They don't want your relationship public
-Your partner spends longer time on errands than usual
-Your partner is vague on his family and relationships