Would you put up with it?!

Alright so I need yalls input on a situation. I've been with my boyfriend for almost a year now but he had this girlfriend who he was with for about 2 years (2012-2014) who used to live with his mom (she lived with her even after they broke up he left because he didn't want anything to do with her anymore) Well this beezy caused a lot of problems in our relationship and when we moved to the apartment upstairs and she realized i wasn't going anywhere and he wanted to be with me she moved out (June '15). Well I've because extremely close to his mother and she told me that woman was nothing but trouble and what not but since she was with her son so long she's at all the family gathers (other relatives not my mother in laws ) she has similar friends to my mother in law (yeah she was WAAAAY older than my boyfriend about 5 years shy from being my mother in laws age) and on top of all of that I have to see her stupid face every Sunday at church. Alright so my brother in law ( he's about 13) was showing me pics on his iPad and I was going thru some of the ones from a wedding last weekend that we didn't attend because she was there and I saw a bunch of pics of her with everyone and it really got to me because I realized that this female is always gonna be a part of their life no matter what. Am I wrong for being upset ?!