It is not necessarily true that being "too nice" to someone means that you are desperately trying to win their heart. People can have different perceptions of what it means to be nice, and what constitutes "too nice" can vary depending on the situation and the individual. In your case, it seems like you have been kind and generous to your friends and to the man you recently met, but that your actions may have been misinterpreted by him and his friend. It is important to remember that you cannot control how others perceive your actions, and that it is okay to be kind and thoughtful towards others without feeling like you need to prove anything. Ultimately, the most important thing is to be true to yourself and to do what makes you happy.