Ennui

What’s the difference between ennui and dread? Am I depressed or simply suffering from a change in circumstance which mediates against spontaneous reunions with friends? Am I shallow and fearful of myself since I have spent six months with no one else, or have I simply come to find I crave a sense of being part of others’ lives now I know myself and death .. What’s the difference between ennui and being depressed?