Emotions building up

I have been going through a rough patch lately and I don't know where to start to get me out of this rut. I have an ex fiance (father of my 2 kids) that constantly plays mind games with me and is very manipulative & jealous, he has been staying with us for the last few weeks since he was gone for 8 months but now has no where to stay, he is one of my problems. Secondly, I have a family member as my house mate, who is starting to drain me, financially and emotionally, always in mine and my exes business and starts arguments. Last night as they argued I don't know what came over me but I couldn't hold in my feelings, I lost my shit and I'm never ever an angry person. I finally see they are taking advantage of my kindness and using me, although they are good at pointing out the others faults. I know the easy part is to kick them both out but I'm just not the type of person that will leave someone when they have nothing. I hate how nice I am, how much I think about others feelings, this emotion is all built up and I feel so stuck, lost and out of reach of being happy within myself. Does anyone have any advice for me, I know what I need to do I just don't know how or where to start..