I've recently gotten engaged to my partner. We've been together for over 5 years. We were talking about the cost of the wedding and I don't have anyone in my family to help with the costs while she's got her mum and an uncle who has said they'll help with a small amount.

My partner said she thinks we should split the costs 50/50, and expects her half to include the money from her family. We started talking about guest lists and I'll have maybe 10-15 people on my side whereas shes looking at inviting 90-110 people to both the wedding and the reception.

I mentioned to her it's not affordable for me to be paying half of the costs if she's inviting that many people since it's over what is budgeted and that it would only be fair for her to pay the majority of the costs or to invite less people if she wants the 50/59 split. Most of the people she's inviting are more acquaintances than close friends or family anyway.

She refused these ideas and said it should stay 50/50. I just repeated that I'd pay half of the costs if the guest lists were fairly even otherwise it's only fair for her to pay more.

She said I wasn't being fair and that the wedding is both of ours so the costa should be evenly shared.

AITAH for expecting my partner to pay more towards the wedding if she wants a much larger guest list?