3 years and long distance

I'm going through an awful breakup now.. my boyfriend broke up with me 4 days ago by the text on whatsapp. We were together for 3 years and had a lot of plans for future, looking at apartments and even got a dog which is now with me. I was ready to put everything in my life to hold because we were planing a future together in his country, and i really put everything to hold, only caring for our dog, doing simple chores in my house and waited for his text because we were almoust 2000 miles apart. I was staying with him and his parents for weeks and months at the time and I really conected with them as well as them with me. Me and my man fought for last two months constantly, and long distance and covid-19 situatuon didn't really helped. It's been 4 days and I'm a wreck.The problem is that I blame myself a lot cause I sorta always mentioned breakups in every fight, even over something dumb. I was beeing childish while he was the one that tried to fix things always, and I was cold, but I knew that I never wanted to leave him for sure, it was said in some kind of a rage when we fought. Now in 2 months he was acting cold and sorta started to behave like me, like I was behaving to him. And honestly I didn't like that, it was awful.. he was cold, not interested, not romantic or sweet. He was just cold, but just for me. Every time I tried to talk about my feelings he would get upset and angry saying that I was behaving the same way before and now I don't like that. Afrer our last breakup (before 4 weeks), when we talked and decided to stay together he told me that I have to promise him that this is the last time I would mention breakup, I promised, but 2 weeks after I did it again, in a rage of a fight I wrote "I want this to end" and he wasn't interested in fighting for us anymore, cause he said he is tired emotionally and can't do that anymore. When he said he isn't interested in fighting about us and he doesn't know how's he felling I asked him "why don't you leave me?" And he replied "I don't know", took 1 day off of chating and the next day he broke up with me with a text. The worst part is that i started to realize in one period prier to this that I'm in wrong and I really wanted to change everything for him, but he doesn't believe me. A day after we broke up he deleted all ours pictures from social media and posted one with him and his car. Bunch of girls liked that photo and i checked some of them to realize that he started liking their poosts as well as following them. He neved did that when we were together. I'm devestated