Seeking advice regarding my relationship

My bf and I have been in a long distance relationship for around 4.5 years now. Somehow around 3 months ago i started to feel like i don't feel a connection for him anymore. I don't feel the same things. Around a month ago, i met someone else and we kissed. I told my bf and i told him i wanted to break up but he wouldn't let me and kinda forced me into trying again. I'm honestly no longer invested in this relationship. What do you think ladies? Am I a mean girl?? Should I break up with him and if so how?