People who criticise and denigrate others frequently feel inferior to them. This might lead to cruel behaviour towards women when dating.
Guys who become "doormats" and lack opinions may be insecure in their relationships. This type of behaviour can lead to resentment and angry outbursts.
Dominant guys lack confidence. They may not make good lovers because they see their spouse as a means to validate their masculinity.
Men who often brag about their achievements or strive to impress their partners may be uneasy about their place in the relationship.
Men who regularly brag about their sexual conquests may have major sexual confidence issues and are likely anxious about it.
Insecurities frequently manifest themselves in some way. Loud or rude behaviour, or moaning about being a "nice guy," can signal relationship insecurity.
Insecure males may treat their partner nicely while expressing contempt for women in general. Small and insecure guys frequently use hatred as a coping method.
Guy sweating, trembling, and nearly vomiting due to anxieties is an indication of low confidence in dating you, but it's salvageable and may improve over time.
"I need your approval or tell me I'm fantastic." - Translation: Uncertainty seeking reassurance.