Fear of housemate

Hey, so this my frist post and it is a long and stupid one but I don't know what to do. Sorry

So two week ago we has a party at my flat and it was overall a good night. I got a little drunk and kissed someone but they were single so I did think it was a problem at the time ...but yesterday I found out that my housemate has been mad at me for not apologising, I got a little scared because they told me in my room and even thought they did this so passive aggressively that I need my other housemates to explain what they where mad about, I though it was ok and then spent the rest of the day trying to work out what to do.. but at dinner time I found out that my housemate was just mad because I had kissed their friend but that there friend had used me to get back at them (a plan that worked) after finding this out I realised that they have been very angry at me and getting angry each day , I then had a melt down in the kichen and then when up stairs to my room and even thought I was upset but I was ok and got some work done on my PC and everything was ok until I turned the PC of to go to bed when my anxiety hit level 400 and I had to lock my door and hid under covers with music but was still terrified. I now can't even enter a room that the roommate is in let alone talk to them as every time I see them I get terrified.

The long it gose with out talking to them the worse it will get but I can't even stand facing them right now.

I don't know what to do.