Are you asking if the male will get stressed from loneliness? I assure you that the male will suffer no ill consequences from being by himself... he probably no longer remembers the female anymore as it is. I wouldn't worry about him being alone for the time being. But, I understand how much it sucks to lose a frog.
Keep in mind, that if you buy a froglet, that you will have to raise it up to sufficient size before you can put it ith the adult male.
Where are you located? Are you in Canada? If you are, contact Mark Pepper at
www.understoryenterprises.com Mark is the number one dart frog guy in the country.
Good luck.
Double J