Guys! How would you feel if...?

How would you feel if you had a 1 year fling with this girl like fwb and then you lost all contact with her, and after two years you receive a face-book message and she added you as a friend... not to mention that she's all grown up now and extremely hot & plus she is single. Would you remember all the great memories that you two had and add her (maybe even catch up and ask her out) or would you just ignore her? And now she's 18 and you're 22. So what would you do if you were in that position?