Most Helpful Guy
If you don't love him, then leave. You're going to hurt him more by pretending you 'love' him. Instead, be direct with him and break up. He's going to get hurt either way, but ultimately you two will be happier in the long run.
Most Helpful Girl
Your love for him has outgrown. This does happen to many people. I think the best thing is to talk to hhim about how you feel. Try to rekindle the relationship or its time to move on. Just don't do something yout regret and remember life is too short to be miserable and sad.