That just means that you're not using him enough to make him happy, but you are using him enough to prevent him from becoming unhappy, or he realizes that his value doesn't merit you using him more.
it would be nice to make it where player is with you for like 5+ years his opinion goes from Neutral to Happy .
Disagree. Longevity does not guarantee happiness. Long-term sitting on the bench is the reason one of my players is actually unhappy and won't renegotiate his contract with me.