really insecure

I'm extremely insecure and it's starting to impact on my relationship with my boyfriend. He tells me when he finds other girls attractive and has 'liked' girls whilst out with me. I never feel good enough but he keeps telling me to have faith in him and to trust him. I feel drained right now. I don't know how I to feel. I love him so much but hate him. It's bitter sweet. Can anyone relate?