Mixed feelings?

My boyfriend has been having mixed feelings lately and I don’t know what to do. I know this is a challenge for our relationship and a opportunity for it to grow stronger and us to grow closer together, it happens I know to some relationships but I worry that things might end. He says he doesn’t want to just give up because this is the longest relationship he has been in and says that he cares a lot about me. I really need some positive vibes my way guys 😕