<human>: Could you distill the essence of the text into 1-3 sentences?

Basically we've been dating for a little over a year...  and I grossly underestimated the tolerance needed to date someone with 2 young boys.  At first it was weird but after a while I tried harder and harder to bond with them... but now it is just to the point where I can't stand being around them.  What makes it more complicated is that I just started my own business and now my girlfriend expects me to take time out of my day every time she has them and it is really distracting / stressing me out because I can't stay focused on the business when I am coming home to be around 2 kids I don't even like.  They have behavioral problems that mostly stem from her ex husbands lack of discipline...  we are constantly having to get them to use their manners..   the pee on everything.........  today the older (and potty trained) one peed intentionally behind our chair in the living room.   It's just stressing me out and I fear that if I don't do something now it could just fall off the rails later.  I don't want to hurt my girlfriend but it's growing harder and harder as time goes by.  Maybe I am being a dick about everything?  I don't know... it's just hard to be in this position and I don't know what to do.
<bot>: I'm resenting my girlfriends kids more and more as time goes by and having recently started my own business I fear that it will become unbearable to the point of disaster...