I've been cheated on

Two weeks ago my boyfriend and father of my daughter that is 15 months left me, he said he wasn't happy even though things were going really good. Two days later I find out I'm pregnant. Today I find out he cheated on me the day before he left me.. I was finally starting to feel a little better and now I'm hurting more than ever. My stomach is in knots and I have to keep catching my breath. I'm so lost, confused and hurt... any woman with advice or who have been through the same thing