He didn’t come back on his own though even though he “missed” me he didn’t try to reach out even once. This is the first time he actually blocked my number and I don’t know what to do
Do nothing except for move on. He's a giant man baby who doesn't know how to use his words to communicate. He wants to quasi-punish you and make you feel helpless at the same time instead. Do you want to have this happen over & over? Do not apologize. He's into he punishes while you grovel and beg for his forgiveness instead of talking it out like two adults. That is not a healthy dynamic.
Think about it. What if you got stranded or in an accident and couldn't reach your family/friends and only had him ... but giant man baby has weaponized social media and his iphone to block you. Believe me, you do not want to keep it going with this man.