Me myself a dota player as well. My gf will complain n ask me " dota so fun meh?" haha, she even tried to plays it.
But da main point here is tolerant between u n ur couple bah. Its nothing to do with da games actually, as da reason ur couple is complaining as u rather spending time no gaming than acompany her/him. Next, "da game so fun untill u ignore me?", tis kinda question will pop out in ur couple's mind doubting herself/himself.