me & my ex have a good relationship, have done for the past couple of years since we broke up. he had a new girlfriend in between us breaking up and now, but they ended when he decided to surprise-visit her at uni and she wouldn't let him in her room (he had to sleep at her neighbours). He doesnt know what happened there, but all signs point to her having someone else in her room. they didnt talk for about a year and a half, but now he decided to call her again & he is going to stay with her for a weekend soon. i think this is a huge mistake, and am pretty sure she is going to hurt him again but i dont know how to tell him this without sounding like a jealous ex.... any solutions?