My suggestion will be.. person in love don't have to think separation. if anybody do that , yes there is fear inside him. Which troubling him.... You can ask him reason? It should be valid reason. If he ans you some Silly or bakwas reason then he want someone to entertainment till he don't get another one. If he is hiding something which big serious ,then you should secure him with your trust , m with u in all fights..
Best of luck dear