Do you think its possible for feelings to come back or did they just never leave?

Me and my ex split up two years ago, because of something I did that really hurt him just before we were officially together, it kind of haunted him. We were very much in love but we argued ALOT and it just didn't work out. Two years on, I came across a load of old memos of things he'd said to me, photos of us etc. and its as if all my feelings have come rushing back. I keep crying, thinking how I lost him, and feeling incredibly jealous of his girlfriend - they are in fact ridiculously good together, and until now I was very happy for him. We're still friends, and we still speak every now and then, admittedly he does occasionally flirt with me, and I flirt back, and he has always done this with me whenever hes been with someone new (hes had two girlfriends since me). What I'm wondering is if I ever actually moved on? I've liked people since the relationship, but haven't actually been committed to anyone. I mean is it possible for feelings to suddenly come back or did they never leave in the first place?

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