My Homeboy tell lies and he keep telling me he change. But it seem that he trying to pull me down with him.?

Well me and Bud been cool for 4 year and we grow up and the hood together.But oneday Bud Happen to Start doing thing like getting high and smoking going to clubs. He begin to hide it from his parent and grandma.And me Because i was the tpye of boy who went to church and praise god and I would encourage him.When i had the chance to do so. But one thing about me was that i was quite and i had a good such of humor to grown up who was older then me.But back to bud well bud starting getting confuse due to wat the weed and smoking did to him n for reason just aint giving up . But he telling me he done but i know that not true because one day he say well marion i want to be cool and he flip and try to tell me i dont know about u like i mess it up people want throw thing on you wen dare life is not going rite. wat type of friend is that and pulse he like my sister and she dont like him.which one day i say bud i know that you wont do noting to try to kiss my sis i know it. he kiss my sister and tryed to hide it .But month later he start blaming me for the problem that he did to him self and he was like i never want to spend time but he always and town at his gma house i mean this is a everyday thing leave the house at 11 am and stay gone and come back at 10pm so he txt me at 1023 like am the last thing on his list . And he get up set i feel that i should not be his friend due to how he just start cursing you out for noting specially. when a person sit dare and encourage you and you do me wrong like that wat shall i tell this friend of mind because he aint getting know better. and i dont need to pull my self and the hole .which am not dum am just getting a advise right here. he and we been txting 2 month straight and he use to call. and we are senior this year..and am trying to do sumthing with my life and come bk and enjoy.