Will my husband forget her and love me again?

my hubby had an emotional affair with a colleague, it started in 2006, he was ooking for a job and not getting one. our financial status was not great she got married a few month later and left the job. she joined again around 3 years back. when she joined she seen he had a better post and salary and they started chatting and exchanging mails. i recently discovered and confronted him. i had started hurting myself and crying bitterly. i then told him he has to choose any one of us. he said he choose me and is not in touch with her. he spends his weekends with me. he told me though he has feelings for her he could never leave me. should i trust him. we also had met 13 years ago in office where he was madly in love with me. he used to be so possesive about me. i changed a lot for him. he used to get angry when other men spoke to me. then i wonder how could he be okay with having feelings for this married woman with a kid. her hubby is no more now. though he told me he is not in touch with her how do i trust him? i have lost a lot of weight recently and get a lot of compliments....my hubby has seen that, besides i was there in my hubby's bad times....i remind him of that....will he be able to forget the b****