find something more interesting to do with your time. pretty much anything is more interesting than being ignored by someone who is supposed to treat you special. then you will see he isn't as important as you thought. it seems as if he might not think you are as important as his video games or dude friends.
if it were me i would be pissed and i would give him a piece of my mind, and ask for answers from him. You are his girlfriend you deserve to know what's up without having to guess why he is ignoring you.
Maybe hes busy and the best thing to do is give him space and let him come to you and try to focus as much as you can on yourself so when he comes back he sees a stronger you and you not worrying or losing yourself over him ignoring you and if hes doing it on purpose then next time u ignore him and show him how its not nice to ignore someone when u can simply say your busy or want space but try to focus on positive things about your relationships until he text back and on yourself
Move on, don't waste your time obsessing over someone who doesn't want you, if he did then he wouldn't ignore you! Have some pride and get past him, find someone who doesn't play childish games. Mrs_h married?? playing around???