Extremely turned off by sex

Before I got pregnant I never really enjoyed sex and now that I'm pregnant it's even worse. I am completely turned off by sex and my partner complains about me always complaining about having sex, about how he always has to beg me, about how i never take initiative, i just don't know what to do. It feels wrong to have sex just to please him and not enjoy it. To have sex and feel like I am disrespecting my body to keep him happy. I don't want him to cheat on me but I just don't know what to do. Maybe we should just split up so he can find someone more compatible with him sexually ? I do love him but I'm tired of being accused of not keeping him happy for all these years