ok so quick story time and question

ok so my baby is 7 months old and doesn’t really take formula since he is exclusively breastfed and he doesn’t always take a bottle whether it breast milk or formula even though i gave him bottles since birth . but anyways my bd and I always argue about me sending the baby with his mom to watch him even for something little like going to a interview for 10 mins . but my baby he will not eat from the bottle and will cry the whole time when i do leave .in mind she doesn’t like me but act like she does now that i have a baby . she sees him when my bd comes home on leave for holidays or the weekends whenever since he is in the military and i don’t be home at all until he goes back to base . and she talks behind my back about me to him but he didn’t say it i find out myself but i don’t make it a problem and keep it my self . he gets mad when i say why would i send him over there and i don’t feel comfortable with sending him anywhere and that she stays on the other side of town from me why send him over there just to pick him right back up and i will have to come right back plus i don’t have that much of reliable transportation since i don’t have a car or a job and my mom does work etc ik he won’t eat if he do get hungry , plus i will be on sb else time for me to get my baby back then he will say he gone eat eventually .