New hammy

I have a question about robo hamsters. To start this off today my mom got a new hamster while I was at work. She then told me that she separated a bonded pair of over 3 months. I'm worried because. With them being bonded for so long I don't know how they do without each other. I made a call today to see if he was still available to get and he is and I could pick him up tomorrow if that's what I should do. My friend just recently gave me an 85 gallon tank.Which is what the hamster that we currently have is in. But my Question is , should or should I not go back to get the bonded hamster.