So my boyfriend and I occasionally use spermicide and pull out method together as a form of birth control. It was his idea and we both enjoy it. But yesterday he told me that when we had sex with spermicide 2 weeks ago, he didn't pull out on time! He was worried and didn't tell me because I would be upset. He told me because I got my period and he was relieved. Should I trust him? Should I be upset at him? I don't know how I should feel about this or him....