im in the same postion except its my boyfriend. he recently admited he had small feelings for this other girl and it hurt me a lot, but hes over it now, and so am i. instead of 'talking' to her about it, DO NOT DO THAT!! xD people have this sick part to them where they like to make there other half jealous, and if you start saying its making you jealous, itll only get worse, not because she likes him, just because its getting a reaction out of you. i suggest everytime she meets with him or speaks to him or whatever, you make yourself unaailable, in fact make yourself a bit unavailable for a while, i dont mean ignore her of coruse, just socialise a bit without her and make her a bit jealous. YESSS its immature, but it actually works when that person realises that your not always going to be there.