Should I move out?

Mo
Ok I have a dilemma. I want to move out my mum's house because I'm nearly 24 and she is getting remarried in August. I'm very happy for her but feel like her and her fiance need the time together and I don't want to be the third wheel. However I'm not very well and have a number of illnesses. I'm on disability benefit and have a small dog. There is literally no accommodation that will accept me because of it. I know I could cope on my own if I stay wise but my mum is worried. On the other hand her and my bf says to move in with him, but his land lady prefers that I don't have a dog. But he is putting down a deposit for a mortgage within the next year and will have his own house. My question is what should I do out of these three options? Of course either way I would pay rent to help out as I already do my mum.

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