Might have been a real
doh moment.
Biggest problems I can see happening are;
1/. She has to remember she is an ex and has to pay
all her share costs.
2/. You have to remember she is an ex when the new boy friend turns up.
No harm in giving it a go - if you get on all right, you should be able to discuss any living problems before they get out of hand. Give that garage a sweep out just in case tho....