I don't have a desert rose crystal but would love to have one - especially as they would never stop flowering
Mariam - As now would be about the right time for your plant to start going dormant, it wouldn't be at all unnatural for it to start losing its leaves, however I'm wondering if that is the case, especially as you mentioned that some of its leaves have sprouted back, which could mean - that your plant lost its leaves because of a temperature fluctuation rather than the fact that it was going dormant, which they can sometimes do - when moved from a warm place to a cooler one and vice versa.
Adeniums are naturally slow growers when grown in a pot and watered as they should be. However there are mixed thoughts on this, particularly as some growers have found, that by giving them larger quantities of water it speeds up their growth - which is a bit risky as an Adenium would look good for up to a month after it had rotted from being over-watered, on top of which, the character of the trunk is very much dependent on how much water the plant receives, less gives a more gnarly characterful look whereas more will give a straighter less interesting look.
Yes I thought that was little Tubby hiding behind your plant and a real cutie too
and talking of which, as I always believe its better to be safe rather than sorry, felt that I ought to mention especially as you have two furry companions, that the sap of Adeniums is poisonous to both animals and humans should they come into contact with it,