I have not seen the movie, but I have read the self-help book (“Love Dare”) that is featured in the movie. It is a good, solid read, and does have some excellent suggestions for marriage help. It is written from a generic Christian perspective, but nothing I saw in it contradicted the teachings of the Catholic Church.
The Love Dare method requires patience, and it certainly helps if both spouses are Christian. It also is intended for circumstances where there is some sort of communication and empathy between the spouses. It can help you work through common, ordinary marital problems - such as lack of intimacy, incompatable goals, mismatched sex drives, and the like.
It isn’t written for the “train wreck” stage of marriage, where one (or both) spouses has given up and stopped trying. If your relationship has reached that phase, then I can recommend other books for you to review.