If you don't want your friends to grow tired of hearing about your depression, stop talking about it so much. See them on the "good days" when you can fake it. Reach out when you need support but, know when to stop too. Depressed people are very draining.

Unless your coworkers are also your friends, leave the details at home. Trust me. We don't want your emotional problems at work. Emotional coworkers or those who overshare can be percieved as annoying and create tension. Pretend like your leave was a parental or maternity leave or anything else that is just as boring. It is good to have you back but, just like if you now have a colostomy bag, we really don't need to know!

Fake it. You'll be fine.