Beelzebub is your lover but he doesn't love you and all this time he's just pretending to be cute in front of you.

Beelzebub just liked Lilith and they used to make love every night You didn't even know that they already had a child together, and one year later you found out about Beelzebub and Lilith's relationship but you just kept quiet and decided to leave and you in a state of pregnancy, and it was Beelzebub's son.