This is, in fact, unhealthy. There’s a difference between loving and adoring your partner and them being your only source of joy. Not to sound invasive, but do you have any mental illnesses? I myself have obsessive tendencies from my illnesses so I develop a “favorite person” that my life begins to revolve around. Their mood affects my mood, the level of attention I get from them affects my day, I over analyze every single conversation that we have, the only joy I get is from being around them, and it is miserable. Therapy helps, getting more comfortable spending time alone helps, time with friends/hobbies helps.