Boyfriend going soft during sex

Hey ladys,

So my partner has recently started going soft during sex, he is highly attracted to me and always starts sex with me and is always keen on it but when we start its all great and fine and all of a sudden he goes soft and cant go no more, mind you he is only 25 and is very active, this makes me feel so shit about my self and he ensures me if not me, he is unsure why it’s happening

Has any of you girls had the same experience and did the soft experience stop and go back to normal sex, this has happened the last two times now