estaban mandando
Imperfect progressiveellos/ellas/ustedesconjugation ofmandar.

mandar

Las cosas progresaron tanto que de pronto se estaban mandando mensajes sobre lo mucho que pensaban el uno en el otro, el tipo de futuro que podrían tener juntos y cosas así.
Things had progressed so much that they were sending sweet little messages, saying how much they had been thinking about one another, what kind of future they would have, and things of the like.
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