Why is this happening

I started college in 2020. The first semester was great! I still have my great boyfriend, but this second semester is so very hard for me. One of my cats died, I have been cut out of a friendship group, I am alone. On top of that, I now have covid and I am waiting for my boyfriend to get back from his trip, but until then I am alone and I just have my thoughts. Recently, I have had depression probably from so much stress and mental strain, but I had started to get better. I found a cat that I absolutely adore and I adopted her and took her to my families house last Monday and got back on Friday night, the same night that everyone was exposed. I found out on Sunday that I had been exposed and by Monday everyone around me is testing positive. I am completely alone because my boyfriend is traveling to pick stuff up and everyone else is quarantining. I dont do well being completely alone. I am a severe extravert! I am just so sad and I can't stop it. I just really want to go home and see my family and animals, but I cant because my family members are at risk.