If you put a woman in a family way without paying her bride price or marrying her properly where her father or her people now recognize you as her husband.
She really doesn't owe you faithfulness.
Because you're not her husband.
If you catch her in infidelity, you have no right to summon her people.
And you cannot sue for divorce on grounds of infidelity.
Because she's not your wife.
Both of you are just cohabiting like womanfriend and manfriend.
The only thing that you can do is to break up with her, and continue being a baby daddy.
And in some part of Nigeria and Africa, if she dies while living with you, you'll have to marry her corpse before you claim paternity of the children that she had for you.
End.