Torn and heartbroken

I really need some advice. And before I post this please I understand this is a very sensitive topic but please don’t bash me. I just found out that I am pregnant with my 3rd child. I am currently living with family since the death of my spouse... I love children and would love to have more children but the person that I am pregnant by doesn’t want any more kids. I am heartbroken because he is asking me to have an abortion and while this pregnancy isn’t the best timing for me either I don’t know if I can go through with the abortion. I know it will change both of lives completely and my kids as well because I will probably have to find a bigger place when I move( the place I was going to move into isn’t ready and it wouldn’t be big enough for the 4 of us anyway). I just want to hear from some people who may have been in this situation before. We used the pull out method which I did I previous relationships and never got pregnant using that method before so this is a total shock for me. I don’t want him to resent me if I keep the baby but I don’t think I could have an abortion and go on with life without always wondering what could have been.... some background info.... this person and I have known each other for 10 years, used to be involved 10 years ago, we never got pregnant back then... things ended because it was bad timing. We just reconnected recently and were planning on being together.