I would get some no negativity spells and people protection spells on that place asap. A giant dagaz on the house and invoke no negativity for one.
A bit of unsolicited advice - don't get pulled into their drama. Be a reprieve from that and an ear to listen to him about it without being emotionally involved, and it should help attract him to you. If you're being accused of harming someone even though you didn't, don't go back into that house or even near it - they are too toxic. Being around the negative gets negative on you, cleanse yourself and do spells or carry crystals to protect you from negativity. Your boyfriend could use some too.