Bf likes someone else?

I went on my bf iPad on Monday and I found him saying he likes this girl. I saw him and after a lot of crying and talking I had to leave but he said he still love me, I spoke to the other girl and she did say he told her that he didn't want to lose me, and nothing was going to happen. I forgave him and we was going to work on it and I went to see him and get got on just fine, but then I asked him if he still has feeling for her and he said a bit yes! I keep telling him you can't like to people at ones and he doesn't know why or how he does but I don't know what to do! I love him and we both think we have a further together but knowing he still likes her I don't know what to do! Please help

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