Relationship

I've been with my partner 4 years, he's cheated around 10times maybe more messaging girls behind my back on fb/sc etc and on shag locals and stuff. All my family have disowned me for staying with him and all I have is him. I just want to know how I can get my trust back for him we have 2 kids and a baby on the way, it's not as easy as leave him as I have no money no family nowhere to go and I love him. I have the girls all the time I'm depressed I am not eating so well and I struggle with house work because I'm so depressed. My 3 year old is just naughty and wipes poo everywhere but my partner just doesn't understand. He blames the kids for the way we are with each other as we're constantly stressed we never do anything anymore together. He has for a while stopped all the sites and stuff but he said its cause I don't show him enough love because we never get to spend time together on our own. Need advice