I’ve had the best sex ever after my divorce

My husband and I recently got divorced, following six years in which we didn’t have sex. I then met a boyfriend from my youth and we had the best sex ever. 

How can I tell if there is really something amazing between us, or do I feel this way simply because I have been sex-starved for so long?

After six years of celibacy, sex with a robot would probably be amazing, so I wouldn’t overanalyse this new relationship or burden it with unrealistic expectations.