Need ex advice

My ex and I have been separated for 6 months. He graduated and left me. He attempted to come back but never did because I wanted him to apologize. We've had a lot of petty arguments he was reaching out asking if I was ok saying he missed me  I talked to him about a bill. I asked how he was and he told me miserable .I told him I missed him and he told me to focus on school. I'm finishing college . I really do love him and miss him he is literally my other half and I'm so sad without him here. I've been breaking down crying. I'm trying to just focus on me but I want him back I'm really sad . My grades have gotten worse since all of this . Idk what to do. I don't want to move on . I'm in love with him . I just want him back 😞😞