Above anything else, choose to be with him. Words are cheap when they’re not backed up with action. Don’t leave him on his weakest days because he’s broken. Humans, in general, are meant to be broken so they can experience a breakthrough. Your relationship isn’t true and strong if you leave because you’re not open to this side of him. He doesn’t have to be always strong and manly for you, and vice versa.
The secret to having a long-lasting romantic relationship is to be mutually good and true to one another. Recognize your role in the relationship and be committed to it. You have to be openly vulnerable to your other half as you’re vulnerable to yourself. Ever wondered why you couldn’t maintain a relationship for at least a year? If you find yourself always getting into a new relationship, it would either be you’re not ready to be in one or you’re choosing the wrong person for you.