I think you'll always have a soft spot for your first love. It's a affection that has the newness that can't be replicated by any other relationship. So I think you could be glossing over it a little because she was your first, or maybe are genuinely in love with her. Do you know if she feels the same? How did you two end things previously? That makes a difference in how you feel about her now. You need to think about that and maybe, with caution, explore all things. Sometimes the past is a past for a reason. Good luck.