I think he’s cheating rn..

So. As the title says i think my bd is cheating.. i ended up waking up my baby & driving to his moms house at 11:30 at night to see that he wasn’t there like he was suppose to be & umm it tells me enough.. how do i just let this go? How do i become at peace? All i could do when i got home was hug my baby and apologize for brining her out so late.. like why tf am i looking for someone that gives no fucks I’m home caring for his daughter why am i searching for him? Why tf do i care soooo much? I need advice on how to let this goooo & how to honestly not give a fuck