This sort of thing seems to divide opinions but I'm in a similar sort of situation.
I'm 6 months pregnant with my first child, the father left the second he found out but now he wants back in after 6 months. It's proving to be the hardest thing for me trying to let him back in & trust him enough, 'for the sake of my baby,' (which is a phrase I've read A LOT on this website.)
I'm trying very hard. I'm offering the oppurtunities to get involved, come with me to appointments, ante natal classes, to join me in picking up some nursery things for when the baby arrives but each & every time, he always has something else going on. He's never been the first one to call or text or email, it's always me chasing him up & when I call him out on this, he says I'm being crazy, of course he wants to be involved, blah blah blah. I left a message for him 8 hours ago asking if he wanted to come with me to a babybond scan I've booked for next week as he has missed all the other scans. So far he hasn't replied & I'm very embarassed & angry with myself for even bothering.
When he left I was devastated & hoped beyond all belief that he would come back, but in time, I began to just get on with my baby & I appreciate what I do have. I even began to find some happiness.
However, now that he is back, I'm miserable again. I'm unsure, unconfident, frustrated, tired, depressed. I've cried alone in bed every day that he's been back whereas before, I hadn't cried since a fortnight after he left. He has a way of making me feel silly & foolish, like I'm pestering him or bothering him when HE'S the one who asked to be back in my life. And all this he's doing to me. I hate to think what it will be like when I have my little boy. Now I find myself remembering that old saying, 'be careful what you wish for.'
And all this is just 6 months of absense. I couldn't even begin to imagine what it must be like to have the father try & get in after 6 years of being gone.
I find it incredibly hurtful & a little insulting when so many people say, 'put your feelings out of it, your child deserves to know his father, think of your child,' as though that's what we haven't been doing this whole time. Everybody's situation is unique & there's so much more that goes on in peoples stories than what gets written in these posts.
If it was me, after 6 years, I would say no. I would tell him to stay away. If my child had been happy having just me for the past few years becasue he hadn't known any better, then I would continue on that way. I wouldn't open the can of worms of having to explain to my baby that yes he did have a father this whole time, he just didn't want him.
Thats all I can offer, my personal opinion. I just know that I'm in a situation now of having let my baby's father back into our lives & I wish more than anything that I hadn't.