Fucking weird

My boyfriend is cool with his baby moms brother still which isn’t a problem at all but he sits there and tell him shit about our relationship & then she finds out. LIKE WHEN WILL YOU LEARN TO STOP running your mouth. 2 weeks ago , I decided to leave and things got crazy. Her brother asked him why I did what I did and he said because he kicked me out .. I feel some way. What should I do? Should I leave it alone or what