Neighbors who fall in love?

Hi i am wondering if anyone can help me find this romance book, it was about a widowed Mom who had i believe 3 daughters and she falls in love with her neighbor across the street from her, they meet in the middle of the night when she goes over to confront him about loud music, she is also being stalked by someone, they do have a break up in the book them having agreed to just keep it casual if i am remembering correctly.