My boyfriend is asking me to move in with him to another state where he has a job, How to tell him that I need security (maybe a promising ring?) to be able to do that? What if god forbid we breakup, what will I do then? I'm too shy to say that

If this is so important to you, then you have to tell him. Don't let him push you around to do things that you aren't ready for. You have to tell him why you are concerned and maybe what you two can do together to solve it.

I understand that you fear that this could cause a breakup. But if this is what is best for you and you really want to have a more security, then don't let a guy ruin that for you, even though you love him. Do what is best for you.