Most Helpful Guy
Seems safe enough if he already verbalized he likes kids. Just remind him he doesn't need to go crazy with gifts ^w^
Most Helpful Girl
There's a huge difference between "liking "kids and being part of their life.
Although the kids should be your priority, it's still important for you to have a life outside of family life too, but I'd keep you family life separate from you social life until you are sure the relationship is going to be long-. term. It's hard to put a time limit on it, but I'd introduce them to him no less than 6 months.
Kids as young as yours will like anyone who "mummy" likes they adapt quickly too. So introduce them gradually whe you know this guy has intentions of sticking around.