HELP ME!!

Okay so i need advice.. me and my ex were together for 3 years but towards the end of our relationship things got rough between us and things didnt end so well. we broke up even though i still loved him. a couple months go by we haven't spoke and i just started to move on. i started dating this really nice guy that I've known for awhile now. ive been semi happy but i obviously dont love him yet. Things just arent the same with him even though i can tell he really likes me. well recently my ex just reached out to me and so many emotions have been overwhelming me. At this point everything my current boyfriend had been doing has been annoying me and i think i should maybe leave him but i dont know if ots just because my ex os back. i dont want to miss out on a good guy but i also want to be happy. What should i do??