Nope, not wrong to care at all. I'm sorry. I know how you feel. If you notice a pattern of someone not making an effort to reciprocate the care you show them, you can conclude you have been taken for granted. Relationships of any kind need mutual care and appreciation in order for all involved to function happily and healthily within them. Yes, it is best to look after you first. The more water in your own glass, the more you have available to pour into someone else's glass.