Well first off, you did according to your conscience, you also thought about this person's well being. So there is no true reason to beat yourself up. In fact there's never a good reason for that, God is interested only in fruitful things like change of our behavior, and He has no profit if we keep torturing ourselves. But can you change your behavior? Probably not, because you acted according to your conviction. What you're speaking now sounds to me more like the enemy introducing doubt to trouble you, but you will know best to judge it.
We are not God and it's impossible for us to know everything, other peoples' souls, how will others react to us, or the future. It is not realistic to put that burden upon ourselves. It is enough to do according to one's conscience. You did not ruin any thing, if God set His mind on this person to come to Him the Spirit will draw her. If you're meant to be dating in the future you will be dating. There is no guilt to be had, you did what you genuinely believed was right to do, actually you are so concerned with it that you're second guessing yourself now. Beating yourself up when you did your best is not what God would want for you. Maybe embracing grace and peace will help you gain more clarity in the situation. It is hard to think or see things clearly when burdened with guilt or doubts. Where to go from here? Reject guilt and doubt. Jmo
We are not God and it's impossible for us to know everything, other peoples' souls, how will others react to us, or the future. It is not realistic to put that burden upon ourselves. It is enough to do according to one's conscience. You did not ruin any thing, if God set His mind on this person to come to Him the Spirit will draw her. If you're meant to be dating in the future you will be dating. There is no guilt to be had, you did what you genuinely believed was right to do, actually you are so concerned with it that you're second guessing yourself now. Beating yourself up when you did your best is not what God would want for you. Maybe embracing grace and peace will help you gain more clarity in the situation. It is hard to think or see things clearly when burdened with guilt or doubts. Where to go from here? Reject guilt and doubt. Jmo