My Boyfriend Cheated

My boyfriend cheated on me we been together for 4yrs and i broke up wit him and told him to leave me alone he called me oneday from an unknown number and when i realized it was him i hung up he left me a voicemail saying he hate me and he wish he never messed with me and he sent a text….. Why is he so mad and saying cruel things?

my boyfriend cheated on me and he stayed with the girl he cheated on me with, he then told me that he had had sex wit at least 3 girls during the 10months we were together.. i was faithful to him but he want, i thought he was and i didnt no any of this was going on… i want to make him jealous but idk how