Once two people fall in love and get engaged they should remain true to each other and are no longer available to date others. The engagement generally happens a year or so before the actual wedding. Honesty; loyalty and looking forward to planning the wedding as well as the honeymoon are all responsibilities as well as figuring out where you will live; your financial status at the time and what it will cost to have an apartment or home of your own.
According to the Princeton web dictionary: duty: the social force that binds you to the courses of action demanded by that force; "we must instill a sense of duty in our children"; "every ......
In any Western country the woman can keep the engagement ring. She can take the diamonds out of it and make another ring or sell it. If the engagement was a family heirloom then it should be given...
The couple who just got engaged could have an engagement party two to three weeks later which gives them a chance to invite guests and to give the guests a chance to set the special event aside.