Baby mama #2

So my bf and i have 1 1/2 old daughter and not too long after she was born we took a break but during that break he got someone else pregnant.  Today he got the results and his the father. His not too happy neither am i. I have really bad jealousy issues and the thought of him being around the baby and her mom makes me really angry ik thats bad but i cant help. What should i do?????