The first 5 months sex was fine but the last month it is going not so good i get hard thin when i put it in about 2.3 minutes my dick go soft what wr?

Sounds like early ED: however, could be diabetes, male hormone levels, stress, tension, anxiety. Trying going slower, using, music, massage, light touch, visual aids or movies, lingerie, toys and changing positions. Go slowly and enjoy yourself, but get checked by a physician.

Erectile Dysfunction: You appear to have some form of ED. As described, it may be a psychological component associated with it as well and performance anxiety can play a major role in the process of erections and sex. See the Dr. for some testing and an exam to be safe. Best wishes.