I think my fiancé is depressed

My fiancée revealed to me that he relies his happiness on the expectations he has on others. He now realizes that he is the only one responsible for his happiness and it’s not solely my job.

He struggles a lot with self-esteem and feeling worthy. He get agitated easily and says that he feel like I don’t do enough to love him. He would vent angrily at times and forget about it after. He doesn’t like talking about emotions and doesn’t care for ‘soft’ affection like hugs and cuddles.

I love this man and would follow him to the end of earth. I would love to hear if anyone has had similar experiences with their partner or have tips to share in how to navigate loving a depressed partner.