How can he be so cold

These last few weeks of our relationship have been horrible! He's so wrapped up in social media I can actually see its changed his whole personality. Yes we've had our fair share of problems, but in 7 years of us being together this time is so different. He just doesn't care about us anymore. I feel so unloved, so unwanted and worthless. If I tell him how I feel he just blanks me, but then he will act and speak like everything's fine between us. Him blowing hot and cold is messing with my head. I've no idea where I stand or what to do. This morning before he left for work he was his being his usual heartless self and I mentioned I would leave if he wanted me to go (it's his house) and he said "well you can't afford to leave can you" that's said it all for me. So I'm leaving. I'm broken and I don't know how I'm going to get over this but I know I have to go. I've sent him a message saying I'll be out ASAP as I'm currently making arrangements. I also told him that he's changed in the past few weeks ever since he's been so full on into Instagram, doesn't take a genius to work out why. He knows how much I love him and he knows I would of done anything for him, but he wanted to put all his energy onto other girls on social media instead. I can't live like this anymore. I can't eat, I just want to constantly sleep and forget about everything but we have a 15 month old baby and I need to find us a place to live 💔

Update: he's messaged me back saying he does love me but the relationship is fucked. I've told him it's only fucked because he papers over the cracks instead of sitting down and working with me to resolve past issues. He won't talk which is a major problem! He then went onto say how he needs to sell the house because he can't afford it because he's the one that pays for everything:: first of all he bought that house not me, secondly as I'm a sahm I've always mentioned me going out back to work and he keeps saying no we're fine as we are 🤷🏻‍♀️ and thirdly I pay for the utilities and the big grocery shop to feed us all so it's not like I don't contribute anything at all, I also provide our baby (and my son from a previous relationship) with everything they need regarding food and clothing etc. I've told him he only had to say he was worrying about money and we could have worked something out. Instead he pushed me away by acting distant and shady on social media