Vichitravirya did not reject Amba-
- Amba requested Bhishma to allow her to go to Shalva:
The ruler of the Salvas was before this mentally chosen by me as my lord. By him also, without my father’s knowledge, I was privately solicited. How wouldst you, O Bhishma, born especially as you are in Kuru’s race, transgress the laws of morality and cause one that longs for another to live in your abode? Knowing this, O bull of Bharata’s race, and deliberating in your mind, it behoves you, O mighty-armed one, to accomplish what is proper.
-Mahabharata Udyoga Parva Section CLXXV
- Bhishma allowed her to go but Shalva rejected her:
Unto her, however, O king, the lord of the Salvas said with a laughter,
'O you of the fairest complexion, I no longer desire to make a wife of you who wast to be wedded to another. Therefore, O blessed one, go back thither unto Bhishma’s presence. I no longer desire you that was forcibly ravished by Bhishma. Indeed, when Bhishma, having vanquished the kings, took you away, you didst go with him cheerfully.
-Mahabharata Udyoga Parva Section CLXXVI
- Amba then blamed Bhishma and went to the forest:
Human beings always suffer what is destined for them. The cause, however, of my present affliction is Bhishma, the son of Santanu; I, therefore, see that at present my vengeance should fall upon him, either through ascetic austerities or by battle, for he is the cause of my woe! But what king is there that would venture to vanquish Bhishma in battle?
Having settled this, she issued out of the city for repairing to an asylum of the high-souled ascetics of virtuous deeds. The night she stayed there, surrounded by those ascetics.
-Mahabharata Udyoga Parva Section CLXXVII
So no, Vichitravirya did not reject Amba. Amba left with Bhishma permission and never came back to Hastinapura.