why does antigone use bridal use bridal imagery to speak of her imminent death?

Antigone sees her tomb as her bridal bed. It is also significant to note that Haemon (her fiance) will join her in death, although she doesn't know this at the time.

Antigone sees her tomb as her bridal bed. It is also significant to note that Haemon (her fiance) will join her in death, although she doesn't know this at the time.