Don’t know if I can get over the betrayal

Partner planned to end his life, and the following day he told me he had £55k debt from gambling.

This has been going on for four years without my knowledge. We have 3 children and got married last year.

I have gone from feeling terrified and scared over him wanting to end his life to angry, confused and resentful.

I don’t know if I will ever be able to fully trust him again, and I feel terrible for my kids if I make the decision to leave the relationship. I also feel extremely guilty towards my partner that I have these feelings while he is obviously very vulnerable. 

This happened very recently, but I feel very confused about the future.