Advice please is this the end?

I'm really in need of some help/support his kids i fell in love with them and they need stability/love
I told him he had to change jobs which he did
Anyway new year he gets a text of a women from work he messages back she replied n he deleted her reply this women helped him get a perm job by filling his job application out for him he gave her his log in and password (I thought that was very strange)
I found long brown hair his boxers then he was doing a job for someone fixing plugs changing lights etc sent me a pic which had his t-shirt that I bought him on the side of the kitchen I look on her fb when a found it on a mates (for some reason she has me blocked) I've never met her etc
Her kitchen the same as the pics he sent just the cupboards been painted he swears it's not his t-shirt and not her kitchen I let it go again tonight I was on toilet his work clothes at side of me I noticed hair and thought it was mine and would only have him moaning at me I pulled the hair and defo not mine same hairs as before

We gone from always having sex to latterly nothing for 3months now he's says it's coz he's tired all the time with working
Yet when he's ment to be off he's taking so called over time
I'm off for Easter and asked if me n him could have some time together to try sort this out and have some us time he said the other day he's working for the next 7days off Friday day but in Friday night then on nights for 4 then he's off Tuesday morning he's off for 4days I'm back in work that Monday

If the kids didn't have me they would be a mess there mum doesn't give a shit and dad always working
They even said they wish I was there real mum 🤦‍♀️
My heart is broken and my head hurts
I want to belive him that there's nothing going on but I have a gut feeling
Advice please is this the end?
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