Boy trouble

So I am with a good guy, but reminds me of my ex a lot. He is addicted to sex and cannot go without a night without sexting me. Then Ik have this best friend. We did play around a big after my last relationship ended, but stopped after I got into the new relationship. But today he told me he loved me and he kissed me, saying not to forget him. I somewhat love him and I love my boyfriend! What do I do!!!???