Do I have the right to be pissed (read the whole thing plz)

So, my ex.... we were "together" for a year and 3 months but he never 'committed' to me but he ALWAYS told me that he wanted to be with me and me only, and would pull that suicide card once something went bad. Almost 2 years ago i caught him with a girl and called him out about it, he said 'she's just a friend' blah blah blah. But I knew better.. just keep in mind I was going through a death of a really good family friend (might as well call him my uncle..) so emotions were already HIGH. He always complained that his ex cheated on him in their own bed blah blah blah... well one time while we were together, he did the stupidest thing and came inside of me, he knew I wasn't on birth control and knew I wanted kids someday. Well... a day later he got the Plan B pill, I already expressed I didn't wanna take it, many many times, but he guilt tripped me into it (my mistake I guess.) & also isn't that kinda forcing it? I threw it up right when I took it so I don't think it worked anyways idk. Anyways I make custom shirts, his mom texted me asking me if I could make some gender reveal shirts, I texted my mom the screenshot and ask her if she knew who was pregnant, then i found out yesterday that it's the girl I caught him with, she's pregnant... why force me take a plan b pill but not her? Am I just bitter?... or do I have a right to be upset? I just wanna say I'm 100% over him it's been almost 2 years I'm very happy with myself, I've learned how to love myself & I never think about him, I think bout how badly I was treated and what I've been through in my past but not him in general.