I (29f) told my kids' (5m, 3f) father (32m) that he can't see them again because he says he's going to commit suicide.

My childrens' father thinks he is about to be fired from his job (story on that below). This morning, he texted and asked if he could pull our son (5 y.o.) out of school tomorrow. I called him to ask why, and he said it was because he wanted to see the kids one more time before he kills himself. Our daughter is 3, and is not in school, so he would typically have her all day if he is not at work.I told him no, that under no circumstances could he pull our son from school. I also told him that I don't feel the kids are safe around him in his current mental state, and that I would not allow him to see them until he undergoes a psych evaluation. As an aside, we have no formal agreement in place, and we have never gone to court for custody or child support. As an unwed mother in Ohio, I have full legal custody.He's very angry with me now, telling me I'm kicking him when he's down, and that I'm keeping the kids from him just to be malicious. My questions are:Am I making the wrong choice by not allowing him to see the kids until I know he is mentally stable? I will file the necessary paperwork this week, and ask the court to order a psych eval.Should I get a TRO? He threatened his own safety, but I feel unsafe because I cannot trust his state of mind. I'm not sure if I can even get one, because there were no direct threats against the kids or myself (although he has threatened me - not the kids - in the past, but not in the past 6 months or so). I just want to do what is best for my kids. I don't want to be unfair or malicious.In short, he works for a major phone and internet provider. He was told yesterday that he is being investigated for giving a bunch of customers discounts that they didn't qualify for (he said they worked for a certain company that receives discounted service, when they actually did not). They took his phone, and he believes he is going to lose his job.If someone can offer some advice I would greatly appreciate it! I just don't know what to do here. via /r/Parenting http://bit.ly/2WVwT3l