1. Hanging out (too) often
What makes male-female friendships different from only female ones is the fact that for sustaining the first, you don't need everyday socializing, texting or phone calls. But if you are spending too much time together, it is obvious you have a good time.
2. First on a dial list
When something important happens and the first number you dial is his, and on top of that he always has time to listen patiently, maybe it's time to ask yourself some things.
3. Good listener
Man are famous for never listening. Being a good listener is a sign that he cares for someone.
4. Managing to make you smile
Of course, just friends can make each other smile, but if you are using extra effort to make the person sitting opposite you smile, flirt could be your next step. We are not saying it will be, but it's quite possible.
Sending funny texts or sharing information twice a week? Friendship. Constant texting during the day about everything? There is definitively more to it.