Guys 😔😔

Ugh, been with my boyfriend for so long, love him to bits, very comfortable W eachother...recently just started having sex, protected and unprotected..and it's just recently it's like hell be penetrating me doggy then he just gets soft?? It's happened twice and TBH I don't feel as horny anymore and we do foreplay and everything. Idk what's wrong 😔 I just want to enjoy it. But he keeps getting soft everytime we have sex. Is it me???