I chase him away but i want him back!

Hello, i had been dating my ex for only 3 weeks. When i met him, i was suffering a depression and going through some stressful times but i told him this upfront and he told me that he liked everything about me and wouldnt give up on me.

We typicaly spoke all day via text and phone everyday since we met. But during one of my bad days, i shut off communication from him. I apologized and explained that i was just in my head and he accepted that and agreed to move forward but said this caused his gaurd to go up. I did it again less than a week later and he decided he wanted out. Literally stopped taking my calls. I went to his house to try to make up with him. He agreed to meet with me later that night to talk but when i texted him to find out what time he was coming, he said he changed his mind, he doesnt see us going anywhere and that showing up at his house turned him off. He then called me a stalker and crazy. I then said some really mean things via text to him and he said some really cold things to me as well.

Im neither crazy nor a stalker. I just developed really strong feelings for him and i thought he felt the same.

I truly feel like we should be together, it felt so right.

Is this hopeless? Do you think i have a chance to fix this? Or am i being dellusional?