How do know if he is interrested in you?

because my daughter's father has been wanting to have more family time with me and our daughter and we haven't done anything yet. But i do have feelings for him i just dont know how to go about things...its been four years since we havent been together and he gave me a huge the other day outta no wheres..which he hasnt done with in these four years of noot being together..and we are both single..