If a friendship relationship is lied about and kept secret, what are the chances that the relationship was more then friends?
Just from the information in your question, I would answer with a definite yes there was probably more going on than just a friendship. However, there could be additional reasons or circumstances that would prove otherwise. I would make sure you have all of the relevant information before making a final judgment. The best advice in this type of situation is
to trust your "gut" or instincts. This is different from feelings of fear; instead it is the quiet knowingness deep inside that will guide you in the right direction. Be still and listen to that guidance inside of you.