Help me.. its urgent?

Me and my boyfriend are in a relationship for three months now. However ii met my current bestfriend through his cousin whom ii had a relationship with sometime in the past year. My best friend is the person that i confide in. Recently though we hanged out together and the night later he texted me and told me that he love me. I must admit i love him to. I think he knows me more than my boyfriend and knows how ii will react. What should ii do? I really dont wanna leave my boyfriend for my bestfriend... help me please!!! :(