Unwanted

I am pregnant and I have been in this relationship about 5 months. I'm about 6 weeks along. This is an unwanted pregnancy by both of us and I want to terminate and leave him. Finding out that I am pregnant has showed me how much he isn't ready for this or a serious relationship. I already have a kid and I don't want to struggle with two kids. I don't know how to tell him I am leaving him or that he will have to help me pay for the termination. I have already thought about adoption but that means hiding from my family for a year which I cannot do since I already haven't seen them for about a year already. I've already thought long and hard about his and this is what is best for the both of us.