Is it normal if i'm so caring to him but not with others?

As a person, I'm not the most caring and warm person you'll meet. I'm not mean, but I definitely watch myself around people cause I don't easily trust them. So I can be selfish and I put myself as my first priority. However, when I met my current boyfriend, I became so vulnerable with him. I just really liked him and eventually it turned into love. And that love got me so vulnerable, feeling like I'm all for him. I care about him so much and want to take care of him for the rest of my life. I feel though that he has no idea about how much I love and care for him. Besides him though, there are no other people or no other time where I'll dedicate myself to them and be so committed. People, including my family, look at me like this tough person and all I care about is me which yeah its true to a certain extent. At the end of the day, you have to watch out for yourself cause nobody else will. But when it comes to my bf, I'm so devoted to him and there are times when I feel like I need a slap in the face to stop kissing his ass, usually when I feel like he's not appreciating me. But it feels so right and natural to be there for him. For ex, I recently sent him an application for job position he's been looking for and finally after searching, I found it and sent it to him. He seemed pretty excited and loved me for it. But then it feels like that appreciation is gone after a few minutes and he's back to taking advantage of me. So lately, I haven't been there for him as much as I want to be. But idk if Im being a fool for him or he really does mean something especially to a person like me. I wanna tell him that he better appreciate this and know who he's messing with because its unusual for me to care about someone else so he shouldn't even dare to take advantage of my kindness. When you find someone who genuinely loves and cares for you, you better keep that and I think he doesn't realize that right now. I'm scared to tell him though because he's probably gonna take advantage of the fact that I'm always going to be there for him.