These jokes are not of after marriage, but just before marriage.

1. Why Break Up?

A boy went to a florist's shop and asked him to send 24 rose flowers to his girl friend on a certain address.
That the florist had got more flowers than other days so he put 34 flowers in that gift and sent it to that said address.

Next day the boy called his girl friend - "Dear, I have sent you the same number of flowers as the number of years of age." The girl put the phone down.
The boy did not know till today why did she break up with him.