If you feel that you would need to be around to correct or lessen this person's influence on your children,then you are considering the wrong person. God does not give us children so that we can mold them into the coolest, most popular people in school. Our job is to get them to heaven. To do that, we need to raise them believing in God. It is tough to do that if only one parent believes.
Small children ask about eight billion questions in a single day.
The answers to those questions go a long way toward forming the kind of adults they will become. Single people sometimes have this idea that marriage is just some kind of lifelong sex festival and that as long as they have each other, they will never be tempted by other people. There are many times in every marriage when one partner or the other is sexually unavailable do to illness, the last months of pregnancy, and travel. There are also times when spouses just get on each others' nerves. At times like this, other people can seem very appealing.