My Boyfriend CHANGED soo much :( why?

well i have 2 bruises & one scratch with a bruise ... last night i told him my bruise hurts and he started poking it really hard and i tried to stop him but he kept doing it & he thought it was funny... i started to have tears coz the pain... he got mad we got into an argument .. he told me i have to handle pain... and in a way i might be pregnant.. but he still doubts its his child... he was NEVER like this... hes like a completely different person