Cruz in not going to drop out in March.
He has a better shot than Rubio. It is much more likely that Cruz wins TX, his home state, than that Rubio wins FL, his home state.
Cruz will stay in until Trump actually wins the nomination at the least...and maybe until the convention depending on the delegate count.
I still believe a possible Trump/Cruz ticket is in the offing...particularly if Trump needs them to go over the top.
I don’t see Trump forgetting Cruz’ “style’ during the campaign sufficiently to invite him as a running mate for the presidency.