My guess is that things got worse when he moved to Germany. Since he moved, were always heated conversation, not just about jealousy from both but also financial reasons.
Before she went to Germany she was already thinking about breaking up with him, but when she retuned they were making plans about living together there. The last subject of their heated arguments was about him coming to Barcelona for his BD. He didn't want to come because he said that he didn't have the money. Things got so bad that she again was talking about breaking up with him became he didn't have the money to come, but had for other things.