What’s next?!-VENTING

So my SO of 3 1/2 years told me a few days ago that he’s done with me because he can’t take my attitude any longer (17 weeks pregnant) there’s no value in the relationship anymore and he’s wasting his time. We have one child together and one on the way(lost one in 2016).I recently moved backed into the house we shared together in March and it’s been hell since I’ve been called a bitch just totally disrespected. I know I should leave but it’s sooo much easier said than done! I just need some encouragement and a little advice