Should this worry me or not?

Okay, college students - is this your first "boyfriend"? Is he someone you see in your future? If not, don't worry about it, just have fun. If he is someone you think you will be with more than a long time ( more than forever), don't worry about it. She is his past, you are his present. For whatever reason, they are no longer - and you and he are together, like you said. And I am sure in his eyes you are ever as "gorgeous" as the past friend. Remember to be you, love him, and forget them. Hope this helps.