Legal Question in Real Estate Law in Missouri

If you buy the house, with other thatn cash, you will be the mortgagor. Since you aren't married, the boyfriend will not own any of it, unless you deed a portion to him. If you want him to be on the hook, then it needs to be joint mortgage. If he isn't on the note, he won't anything for the house. But, you may execute a seperate note, whereby he agrees to pay you a portion of the mortgage for getting to live there. If you buy the house for cash, there will be no note, mortgage or deed of trust. You could have the house deeded to both of you as single people, and then execute a note whereby he owes you for half of the purchase price.

Good luck