Why do some guys not appreciate the mom?

The father of my daughter and I are not together (she is almost 2 months) he broke up with me when I was about 2 months pregnant. He still would contact me to ask about my appointments.  He did go to the hospital and I let him in the room. Right now he just texts me about our daughter and deposits $100 each week and we have an appointment for Child Support Negotiation. Well I sent him a picture of a comic. I thought it was a nice one. Well he didn't like it one bit. I know him and I won't be together but he should be in a way appreciative or is it just me? I went thru everything and even now I am the one watching her 24/7 which I love but c'mon I feel like I need a verbal thank you or you are doing great.