Abandoned hope? It is mathematically impossible for Cruz to get to 1,237 thru the primaries. And he is so far behind in delegates won, he can't get within 400 delegates of Trump.
Which is why his strategy has been to stop Trump from getting 1237, get as many as possible of his supporters be delegates (though "officially" bound to Trump) and hope for a 2nd ballot win.
If Trump takes Indiana, then those plans are futile.