Worried bout bf he's upset coz he keeps going soft and can only get erect when he's with me. he gets horny but then goes soft before cumming??

Psychological Roots: Problems with erection can often have psychological roots, especially with a young man. However, before making that assumption, you should always rule out any medical causes. If there are none, then consider couples counseling or individual therapy for yourself and/or for him. Psychological factors can include both problems in the relationship and concerns that he may have personally.

Erectile dysfunction: This type of erectile dysfunction,especially in a young, healthy male, is almost always psychogenic rather than due to pathological conditions. For some reason his mental relaxation or concentration wanders resulting in loss of erection. He could consult a sex therapist for evaluation and advice.