my private part.....

Ok so the past week I've been getting these white stuff coming out of my vigina and it hurts a lot .... my boyfriend and I broke up 3 weeks ago then we just got back a week ago ..... and we had sex but I'm scared bc when we broke up he was with this other girl and idk if they did stuff or not ..... I'm worried if he has an infection or something bc I've been getting white stuff out of my vigina so idk help please ?