Why do I feel so worthless?

I can't shake this feeling. Wherever I go and whoever I interact with (apart from a very small number of people) I always feels so insignificant. I'm starting to realise this actually is to do with me and possibly how I am? It can't just be everyone against me surely?

1. Work. Work is work. Come in do my job leave etc. Ive been with my company for just over a year and still feel as though no one cares if I'm here or not. Hardly get acknowledged by people and get blunt arsy emails for my boss.

2. Ex husband. Lies lies lies. To be honest i don't expect anything less but he recently lied about having to go to a memorial service for someone who recently passed away (I didn't know him) so had to drop his daughter back early to attend. I later found out there was no service, he just wanted to go out and get drunk.

3. Family. My parents are getting a new bathroom fitted. I asked my dad how the plans were going etc and he didn't say much. Then when sister in law asks he gets excite and shows her brochures and talks got ages about baths. I own my home so it's not like I dont know about property. I recently had a new shower unit fitted. I realised that no one except sister in law actually really spoke to me directly. No one asked how I was (at the very end of finalising my divorce and need to look for somewhere to live) it's almost as if my life and problems don't exist.

4. Ex boyfriend (the abusive one) still can't get him out of my head. He send me a message this morning from someone elses phone as ove blocked him saying he misses me so much etc. I replied saying I'm in a really bad place right now I'm having a really tough time with life. This message is entirely true. It's what's happening right now. As he text me I was hoping he would see I'm reaching out and send me back some comforting words. His reply 'ok, take care x'

Why do I not matter to anyone? Even my daughter said last night she doesn't love me as I didn't read 3 chapters of her book as it was late and she needed to go to sleep for school.

I cry myself to sleep every night. No one seems to notice I'm literally imploding. I feel I'm so close to the edge right now and I don't even know what the edge is.

I need someone who I care about to just say it's going to be ok and they it's ok to feel like this.