Sounds to me like they aren't in a relationship. Sure, he might try to hide it, but why would she?
If you're so convinced despite what they say, then don't sleep with him. Problem solved.
The fact you aren't accepting what both have told you or just letting go of a “just” FWB because you don't believe what he's telling you makes you sound like a jealous girlfriend, yes.
Total BS, dump him.
5 months is soon tbh.
He said they aren't in a relationship.
She said they aren't in a relationship.
Sounds to me like they aren't in a relationship. Sure, he might try to hide it, but why would she?
If you're so convinced despite what they say, then don't sleep with him. Problem solved.
The fact you aren't accepting what both have told you or just letting go of a “just” FWB because you don't believe what he's telling you makes you sound like a jealous girlfriend, yes.