My first root canal, its still pussing out the gums after second visit, dentist wants to put a crown on, please help!

Well I had a dental abscess so I saved up $1500 to get a root canal.

dentist said it would take 3 visits over the course of 3 weeks.

first he cleaned the infection out, sealed it.

waited a week, opened it, re cleaned it. and sealed it again.

this is where I am now...

Now Im suppose to wait a week and he wants to put a crown on but I still have a dental abscess.

Im very scared because just as I saved up all my money and I dont trust the dentist.