Definitions of sentimentalize:

• verb:   look at with sentimentality or turn into an object of sentiment

  Example: "Don't sentimentalize the past events"

• verb:   make (someone or something) sentimental or imbue with sentimental qualities

  Example: "Too much poetry sentimentalizes the mind"

• verb:   act in a sentimental way or indulge in sentimental thoughts or expression