What to do with these heartbreaking emotions? HELP!?

3 months ago, my ex(25) and my son's mother left for someone (25) from japan. it hurts, i was devastated for awhile, now i am getting somewhat better and starting to see what type of person she is. i am sitting back and watching her fly off with this dude. My 3 year old son has no idea whats going on, it's sad. im sure he's wondering who this new dude is. But i am doing my job to stay being the fahter. at times i feel like i cant control my emotions, if shes irresponsible (with her new beau), she would make new excuses and lies as to why she cannot take care of cameron. She will not pick him up at the right time and i would get madd and yell and scream and cuss. This is not helping the situation, i just look like an ***. But i feel like i have so much anger pent up with this harlot, i just vent out. i know i have to keep it inside...but for how long?! it's torturing sometimes knowing that she doesnt care about my son and just cares about this japanese breakdancer and whats up with him?