Feel depressed

I’m starting to feel very depressed my ex came from a culture where it was acceptable to have more than one wife I always checked before entering the relationship it was only me he wanted but later found he was living a double life.since this I’ve learned that it’s very common for people his culture to have a wife and a woman on the side which they are never remourse full of.I’ve realised there has always been someone else there despite carrying his children if I had known I would never of had his kids I feel like he’s took some of my life away I’m now a single parent & can’t have more kids if I want a proper family again due to personal issues.I’m devestated he’s took away any choices I could have and is giving now this other woman everything now I’ve left.nothing will be secret and a lot of the side woman don’t care it’s just how the culture is they don’t care there is another woman involved.they usually give the other woman everything cars ,houses ,money &I’ve spent all my time in the relationship years and got nothing out of it.I’m just devastated & it’s making me very depressed that I was that meaningless I’ve been crying so much.and feel bad for my poor kids without a dad who’s reliable.i constantly feel upset I ended up in this position and gunna be alone in this life .