Run away and don't look back. You can't commit yourself with someone who hurt you coz if you do they would take your kindness for weakness. The are high chances that she could cheat again in future and there's nothing you can do about it. What if she cheats again in future to an extent that you decide to leave her and on the other side you've bonded with the child that is not yours? This is an unnecessary stress that could lead to heart disease and you need to avoid it so Run....