Can I still have a crush on someone while I already have a boyfriend?
That's hard to say. Why do you think you have a crush on someone else?
I'm probably looking for love that I'm lacking
I think it's normal to still find others attractive even when you're in a relationship, so long as you don't act on those feelings. In addition, if you feel that your partner isn't treating you well you should talk him about it.
I don't want to do anything about it, but I am so confused about this situation.
Attraction is complicated. Many people can be attracted to someone else while already hooked up, you're not alone. Be careful you just don't make things more out of the ordinary by doing more than just feeling that way, unless you can't work out things with your current boyfriend.