Can you give some more details? Contralateral TC is very rare. Simultaneous bilateral TC is even rarer still. My own urologist, after an ultrasound indicated my second TC, ordered an MRI as an added precaution before surgery.
As for how he must be feeling, I'll say that being diagnosed with a second TC was devastating for me. So I can assume the same for him, without knowing anything else about him. In addition to the support any man facing TC would need, somebody facing a second TC or a bilateral TC needs a lot of reassurance that life can still be normal. Some things won't be the same, of course: he'll need to be on lifetime testosterone replacement therapy and will lose his fertility (he'll want to bank sperm, if possible, if you wish to have children in the future). But with a correct dosage of TRT, he can indeed live a perfectly normal life. Please do ask questions here. I'm glad to be of help.
TC1: 1996, right orchiectomy, seminoma stage I 3.5 cm mass, radiation therapy (peri-aortic & pelvic 27.3 Gy)
TC2: 2008, left orchiectomy, seminoma stage IA 5 cm mass, left & right prostheses, AndroGel TRT, surveillance at MSKCC