I have not yet introduced anyone to my kids, but when I do so, I plan to do it very gradually. While YOU might see, or want to see your BF 3+ times/week, I would keep it occasional with the kids. In the vein of introducing him as a friend, keep him at a friend level in terms of frequency & activities with the kids. For instance, if you're having people over for a BBQ, invite your BF. If you want to do a family friendly outing (apple picking, the zoo) once a month or so, invite BF. But I would not make him a significant part of their lives, someone they'd get attached to, until you're much more sure of him. But this will allow you to get a sense of how he would be with the children, and his tolerance for family activities.