"I'm with you"

My boyfriends mother and I got into a fight today because she's been harassing her ex husbands girlfriend, so I told her she needed to let it go and stop letting him control her. She didn't like that very much so she called me some names that weren't very appropriate and stated that me getting pregnant ruined her life. (My boyfriend and I are both 18). So I pointed out how her being obsessed with her ex is causing her children unnecessary termoil and she needed to stop worrying about him and focus on her kids. My boyfriend was at work when this all happened and I assumed he would be upset with me because he had told me earlier to leave it alone but he wasn't and he backed me up. And that was the biggest feeling of relief I've ever had.