I feel so bad for my SO :/ idk if this is tmi for preggie, but I haven't been wanting to have sex at…

I feel so bad for my SO :/ idk if this is tmi for preggie, but I haven't been wanting to have sex at all. And he works out all the time so he is so horny all the time! He keeps making comments about how I constantly reject him :/ I think I'm just exhausted all the time and when the baby is asleep I'm just in the mood to sleep or laze around. Ugh idk if my hormones are just out of whack because I'm breastfeeding or what. I used to love having sex with him :( I want this feeling to go away!