would you be disturbed?

How would you guys feel if you found out that every date you and your boyfriend has been on is every single date him and his ex went on? Would it disturb you guys? Recently his ex's mom sent a friend request to my mom on Facebook, my mom didn't confirm her as a friend but she looked through photos because she was curious as to who it was, and found many pictures of her daughter and my boyfriend. My mom showed me and she told me to not get upset, but quite frankly I am. Every date I went on my boyfriend would tell me things like I'm happy I get to experience this with you, you're unlike any girl. I've never date like this before with any girl, and etc.. only to come to find that he's been lying. He bought me a watch on my graduation and I found out he bought her a watch when she graduated from high school. I was wondering what you guys think of this? Many of you will probably say it's petty, but am I the only one that thinks it's kind of disturbing?