Im getting jealous of stupid reasons

So i been with my boyfriend for a year in a half now. We are expecting our 1st baby soon. Im getting jealous of the fact that he had ex girlfriends in the past and he had sex with them . It makes me mad and grossed out !! I know its the past but it gets too me.. i feel this way everytime im in a relationship with someone. I have issues ... now i hate my boyfriend now. But idk why im jealous and doing this when i had exes too and had sex with them also so who am i to judge? Who am i to speak and be hypocritical?.... im just feeling grossed out . Idk if anyone feels like this too or has had felt like this? Or am i just a psycho person? 😐 idk ... but i shouldnt feel this way because im carrying his baby and im his only baby momma so I should feel happy right??