I have a feeling my boyfriend has been cheating on me, but I do not have solid proof. The main thing I have to go off of is I have noticed in the past month 4 condoms have been missing and we have not used them. Would that be enough proof to go off of? And what is the best way to bring this up to him? He is very defensive when bringing things up to him and will deny everything, so not sure how to start the conversation on this. Any ideas?