I’m confused and really need help!

I’ve been with my boyfriend for just over a month and have just fallen pregnant with his baby.
We’re both 18 and he wants me to get an abortion.
I’ve been against abortions my whole life and really don’t think i could go through with it.
But I’m terrified I’ll lose him and end up on my own.
I haven’t told my parents, I can’t face it until I’ve decided what to do but I know they’ll be supportive no matter what.

What should I do???????