He neglected me and left me after big argument?

Me and my fiance has been together for 4 years. We are in Long Distance Relationship but do see eachother every 2-6 months.

To make this short. My fiance has applied for a new job since april, he want to improve himself and get better income etc. And since then, hes been unavailable emotionally most of the time. We have spoken about this but nothing worked. He's behaviour changed, he doesnt sleep well and always thinking about this new job. His mom told me that hes routin also changed as this new job requires some hard work for them to accept him and he is not sleeping untill 9 in the morning.

I have been supportive, I did everything to be beside him but i feel he doesnt treat me the way i deserve to be treated. Now whenever i confront him about his lack of attention towards me he become defensive and angry and do the opposit of what i want. He never used to be like this, ok we used to argue but way less and he used to always opologise if he was wrong.

I am now in his city and came to visit him and booked it for 4 weeks to stay with a family member but i only met him twice! two weeks had already passed. last week I got angry and told him that its not fair that i come to visit you and you ignore me like that, he respond with anger and said that i dont aporeciate him enough and that hes trying to concentrate on the new job, then we said mean things to eachother and he blocked me from whatsapp and unfollowed me on instagram! I called him three days after and he picked up straight away then i asked him if he doesnt want to be engaged lets just break up and not play games with eachother, he was angry and said hes busy and not willing to talk, i told him i came to visit you is this how you suppose to treat me? he said i dont care about you, then the final respond he got from me is I will never forgive you then I unfollowed him from all social network.

I dont know wht to do!! I am trying to move on and meeting new ppl but he is always on the back of my mind and i feel suffocated! I just want to cry. has he falling out of love? why is he treating me like this? Just two weeks ago when i met him physically he was affectionate and told me how much he loves me. His mom told me many times that her sons are always loyal and they love deeply but maybe she was lying!