Why would my hubby say, he would kill himself if I leave him?

My husband been acting weird lately, he is in debt and the only breadwinner, we live in very expensive city. I used to take care of us financially as i had better income, then I resigned last year after having our 3rd baby.

We still go out a lot and spend family time together, he always get me these spa vouchers in the mist luxurious hotels and do these little nice things for me but he has this habit of always on his laptop/phone whe he is home, doing trading, or texting and then going out at night and never tell his whereabouts. He would come home late and get offended when I get mad at him for not checking in. I don't trust him, I caught him years ago, talking to girls online, and being flirty to mostly half-naked girls and just found out he still follows the same type of girls. I want to find a job and save money and leave him and I'm shoked that he told me he would kill himself.

Why would my hubby say, he would kill himself if I leave him?
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