You need to rethink about it, if you are planning to leave him. Early ejaculation in the young age is common among men due to various psychological reasons. But he can learn slowly and will give you more pleasure. It is heard for men to discuss with their partner when they are suffering with erection difficulties. As you said, he is also unable to sustain harder erection, which is medically termed as erectile dysfunction.
Need to approach a professional physician, both conditions are temporary experienced by young aged men due to fear, stress, anxiety and depression .
