Just because she has said she didn't feel loved doesn't mean she wasn't. Everyone has a love language and maybe theirs was different to her, thus she didn't feel like she was being loved and left. I'm assuming you didn't know her before you two started dating so you really have no right to even be upset. Her giving guys she had dated for two years oral doesn't mean she's loose and doing it to anyone. I think you need to figure out what your problems are before passing judgment on her. You're going to end up losing her by continuing down this path of jealousy. The past is the past and you really can't get upset about her previous relationships.