I am sorry you are going through such a difficult time with the father. Before you can have a chance to get back together, it would be ideal to modify the communication style.
You said two key things in your statement that can help address this problem: "needs time alone" and "He doesn't want to argue anymore". This tells me he is finding more peace alone than with you, and he is trying to avoid arguments with you. But you can change this.
If you want him back, at the very least think in your mind about starting fresh again with him. Think about this before you see him again. Because it sounds like you two are stuck in attack or defense mode with each other. Let expectations go and be at ease with him, and you should see some improvements in your relationship with him, even if it is just at the friendship level. However, it could become romantic again if he starts to enjoy being around you again.