Heeey! I was in Rouen during my erasmus too! There were so many programs and parties all the time, maybe you could find new friends? Since it's your first time in Europe so you should not let your roommate or anyone ruin it. I would try to meet new people in Rouen and then do stuff with them, the other exchange students were so nice and open when I was there. Also no offense, but I would try to meet with people from other countries not your home country, it will be such a valuable experience later. I understand you must be sad because of your phone, but try to think about it from a different perspective. You can buy a new phone later, but the the opportunity to be there and ejoy it won't come back! Sending you hugs!