Gotten broken up with an avoidant last night

My now ex broke up with me last night and for the weeks leading up to it he had slowly started to switch on me. Stopped showing me affection as often, not as much complaints or communication and stopped initiating us hanging out. Just in every way it seemed as though he was detaching himself from me. I few days into our relationship he told me he was thinking of ending it because he feels like he may have an avoidant attachment style but the next day we talked about it and he said he still wants to be with me. Looking back I really shouldn’t just told him to go. Now i feel kinda used and thrown away. I see so much stuff about avoidants not really caring after they drop people and that they feel free. Which kinda sucks to hear but why do so much of them not care to try and work through these internal struggles and just hurt people over and over knowing how they are?