<human>: Could you distill the essence of the text into 1-3 sentences?

So I used to work with both my current GF and the friend (let's call them Bill and Jill), however both have now moved on to other jobs. Jill still lives and works in the same city as me, Bill now lives a few hours away but is still a good friend.

Anyway, due to a few issues in the past, they do not get on, and seem to despise each other. We are all due to go to a wedding in February, as well as it being my birthday shortly, and I obviously want them both there, but I think if I invite them both then the atmosphere is just going to be frosty.

Initially Jill tried to reason with Bill for my sake, but he wasn't interested and was quite rude. Since then I have spoke with Bill and he says he is happy to apologise and try and get on, however, due to the way he acted before, Jill is now averse to sorting things out.

I hate having to think that to have a good time on my birthday I will have to leave one of them out (Bill pretty much....), but I have no idea how to sort it out. Jill and I often argue about it because I would like her to try to be civil one more time, but she will not budge due to he way he treated her before.

Please Help!
<bot>: SO and good friend do not get on...I would love for them to be civil to each other but my attempts seem to just cause arguments between her and me.