I think she broke off their engagement because she felt smothered by him.我想她解除婚约是因为她感觉他的爱快要让她窒息了。They dissolved their marriage.他们已解除婚约。His girlfriend has just told him that she wants to break off their engagement.他的女友刚刚对他说要解除婚约。I shall feel free to call off the engagement.我有解除婚约的自由。