I must be stupid

I must be stupid.

My boyfriend of 4 years cheated on me for a year and a half. Compared me to the other women, blamed me for not being good enough, not being what he wanted, not being experienced sexually enough for him. I caught him over a year ago, he lied to me and continues to lie to me, he still blames me. We argue all the time when I ask why. But yet I still love him. Still want to he with him. I still see a future with him. Why do I? After everything he has done after him hurting me mentally, and emotionally for the past year. Why do I still want him?

I just must be stupid or something.