"They were like two peas in a pod." what does this quote means?

They are like close to each other and have a great bond :)

Explanation:

he is. some of his decisions were very irresponsible and did lead to the death of both romeo and juliet, such as him marrying them too quick or him not clarifying romeo's plan with him.

basically he did not think things through well enough or at all.

hope this