Being serious within a relationship are full of multiple factors for a man which could prove his faithfulness towards his love. These reasons of him being serious are his complete trust within their partner which can tests their honesty and open behavior. During a proper communication a man is serious if they are keen to listen their partner's opinion towards different things they've discussed. Keeping his promises and wanting to greet and meet their partner's family and friends is a one step ahead towards their seriousness for love. Sharing passions with their woman is also a reason if they're serious.