Yes, you need a trim!! When your hair ends have split, they will just keep splitting higher. There is no 'cure' for this. The only way to stop it is to get a trim.
Tips for preventing split ends: keep your hair nourished and moisturized. Oil your ends. Do not wear wool (or any other rough fabrics). Do not wear hoods. Do not use any sulfates. Use a satin or silk pillowcase.
At hip length, going for mid-thigh!
M MP HE HD (med text, med por, high elast, high dens)
Clarify: Nivea Intense Repair
Lo-poo: Nature's Gate CR
RO: TBS Rainforest Moisture, etc
LI: Elvive volume collagen, KCKT
Seal: Grapeseed oil
Gel: Kiss My Face
PT: EO Keratin co
Hair growth stim.: JBCO+EVCO
iherb.com 5-10$ discount code: VHT541 Many natural hair products!