Bestfriend or just friend?

I have a friend he's like my bestfriend & or course he has a girlfriend but lately he's been texting me more then usual we tell each other everything and he gives amazing advice. But now he's been sending me like hearts & kissy faces. He's really flirty and stuff. There was a time where he told me "there is a guy out there wanting you." Lately I don't know exactly what to think.