I need major advice

Okay so I've been dating this guy for about a year now and just recently I've met a guy at my school who is very sweet and is interested in me, well the guy who is interested in me had kissed me last Friday and this Tuesday. I have no clue what to do, my one friend wants me to tell my now boyfriend but I'm kind of scared because he has been getting sort of violent lately, and I am afraid he will lash out on me. Please help any advice would be helpful on what I should do.