The children must hide their love from their families. In the end, the children die as a result of their love. The love between the children is forbidden.
In "Pyramus and Thisbe" the parents simply do not want their children falling in love with each other. We do not know the reason for this and are not told of any feud or conflict. This means that any option that has to do with a conflict between the families should not be chose. Since the children have to hide their love from the families in both pieces of literature, it is safe to say that love between them is forbidden. In the end, Pyramus and Thisbe, Romeo and Juliet die because of their love for each other.
I placed this on your other question.
Sorry if I get this wrong but I’m pretty sure it’s a metaphor
