Feeling lost

I am about to be a single mother with two kid and also.. in nursing school.. I know it should be the least of my worries about me Being single.. he made me think we were going to be a family .. then when I’m already 6 months pregnant now and he decides to cheat.. twice .. now I’m feeling unloved , not pretty.. not enough.. I can’t do this .. I’m not strong enough for this.. any advice ?