Are they living with you or did they move with your boyfriend ?
IF this helps - my husband recently died and I had to leave our home, get a full time job AND move into an apartment - We've been here 2 weeks today & my girls were having a hard time adjusting, but I see good improvements each day & they're getting back to their old 'selves' in the new apartment
and actually playing with their toys again -
if your yorkies are with YOU - maybe a little time is all they need to adjust to the changes ??
Good luck - I hope they get to stay together - I know my 2 girls would be so depressed if seperated....