Hi, I bought a house alone in early 2021 for 336K with a big down payment of 150K.

The current market value of the house is 375K and the remaining balance on the mortgage is at 174K.

My boyfriend would like to buy 50% of the house so I proposed this plan to him : he as to give me 100.5K -> ((375K-174K)/2) and we continue to each pay 50% of the mortgage. So we would have a 50-50 share of the house. But he doesn’t want to take 100K out of is investment since they are not doing great at the time. Instead, he wants to pay 100% of the remaining mortgage and give me 13.5K.

Is it fair for me? That doesn’t seem fair but I don’t really know how to explain it.

Are there any other options?

Edit: Thank you all for your response. This was a harsh but needed wake up call. I guess I will need to think about it. If I decide to go through with my plan it will definitely be with the help of a financial advisor and/or lawyer and it will be notarized. I just want to clarify that my boyfriend has even less financial knowledge than me so his proposal was not coming from a bad place.