End of a relationship doesn't indicate an end of the world. Life has to go on. People with broken relationship can have loads of fun on Valentine's day compared to people who have their partners.

Since so many other people would be single too, your friend has a better prospects to find your match on valentine's day. People have a tendency to enter into relationship easily on Valentine's day than any ordinary day. Help your friend to propose and be proposed.

You can also persuade your friend to go for blind dates on valentines day. Since he/she is not into a relationship any more, there are lots of choices at  disposal, instead of having to spend his/her day with someone whom she sees almost everyday. More over meeting new people would boost his/her confidence considerably.

You can also make your friend's Valentine's day romantic in several other ways. You can pick top 5 best romantic movies to watch, which can strike the chords in his/her heart. Choose movies with happy ending which can lighten up moods. 

You can gift your friend with a nice romantic novel, and ask him/her to chill at home with soft music and good wine. It would let your friend's imagination loose and takes him/her for a flight of fantasy.

You can take your friend to some beautiful romantic places and spend your time there. Nature has a deep influence on your heart. When it casts spell, your heart becomes an easy captive and your soul is soothed.

There is lots of romance in the air. Your friend must come out of her/his  mental shell to experience it. You must make them understand that it's only he/she who can help himself/herself out of the trauma of a broken relationship.