Why does the mind and heart contradict each other?

Sometimes I find it really difficult to feel contented even though I know I am a really lucky girl already! I really hate this part of me too but I dunno why my expectations just start to increase and I will unknowingly try to pick on minor faults. Teddy is really quite nice to me already though he doesn't have much time for me and he is contented with just going on super simple dates. But I have always wanted someone who is hardworking, chooses work over fun, does not club or drink anymore. So why is the bitchy part of me starting to feel uncontented and keep wanting more? Maybe the problem really lies with me, he lets me go out and have fun and even tells me to enjoy myself even though he is struggling with school work etc. Ugh I should really learn to count my blessings but honestly I do wish he will be a lil more romantic and spring surprises to make life more fun :)