Why is he ignoring me all of a sudden?

Basically I split up with my ex because I had problems including anorexia. I don't like people getting close to me because once my old group of friends found out and they suddenly turned on me calling me for being anorexic and saying things like I deserve to die. I also have never been loved in my life until he came along. But I decided not to tell him because I thought it'll ruin it and it all built up and I split with him. Then I realised how much I need and love him. He got another girlfriend a month after and now it's breaking my heart. I told him and we've been talking this past month about it and he's recently said he's worried for me and cares for me. Because this has been upsetting for me, I can't eat much anymore and I'm dangerously losing weight and falling into depression. I really need him back. I sent him a text today but he's strangely hasn't replied. I never bombard him with texts, I do let him have his own space. But what do I do? I can't carry on like this, I really do need him. I'm scared that i'm going to lose too much weight that i'll get put into hospital and I keep getting thoughts about death and how easy it seems to put myself out of this misery. What can I do? I know I sound dramatic but I love him and need him to literally save my life.