Don’t be his cheerleader unless he will also be yours. Don’t hold his coat while he does awesome things unless he is also willing to hold your coat when you are being awesome. Do not make yourself his audience if he never let’s you on stage.
Life is more manageable as a multifaceted individual. Be open-minded, but stand for something. Be forgiving, but unfuckwithable in any given moment. Be reliable, but prioritize around your schedule. Be a good fucking person — even when you have a good fucking reason not to be.