My husband asked me the same question when we started dating. I was honest with him about it, telling him no. He was a bit taken back by it, but I said it because I wanted our relationship built on truth. I don't regret telling him that day because he learned that he could trust me. I don't fake orgasms, either, so there are no guessing games with me between the sheets. We're still together almost 15 years later so he's doing something right. Women seem to return to your bed repeatedly (2 long-term relationships) so you must be doing something right as well. 
It sounds like this revelation from your last relationship has taken a huge toll on your self-worth and confidence. I know it's easier said than done, but you honestly just have to put your ego aside in the bedroom. You want a woman that is honest in the bedroom and doesn't feel pressured to lie to you about size, performance, etc. If this is really eroding your ego, go get some counseling. If this is about you being a great lover, put your ego aside and pay attention to her needs. It will yield dividends 100 fold.
It sounds like this revelation from your last relationship has taken a huge toll on your self-worth and confidence. I know it's easier said than done, but you honestly just have to put your ego aside in the bedroom. You want a woman that is honest in the bedroom and doesn't feel pressured to lie to you about size, performance, etc. If this is really eroding your ego, go get some counseling. If this is about you being a great lover, put your ego aside and pay attention to her needs. It will yield dividends 100 fold.