I'm having a hard time deciphering what you're trying to say because you're not making complete sentences or using punctuation.
What Scott is saying is that there is no reason that your children, at their current ages, should be able to handle a new boyfriend. If they can't, then they've been far too sheltered from reality. Divorced parents date, that's a part of life. If your ex has found someone who makes her happy, your children should be able to see and accept that for what it is, not telling you that they need to be "saved."