Male friend claims age difference is an issue to date, but doesn't want to lose me as a friend, why keep me around at all?

Anonymous
I have a guy friend. We talk almost everyday about anything and everything, we've talked about dating each other a few times but he says our age difference is an issue long term. He's 18 years older than me, I feel it has more to do with him not being remotely over his ex. I've seen this first hand. He constantly flirts with me and occasionally will hint at more even after he says things about our age difference being an issue. Is he just using the age difference and the supposed fear of losing our friendship to keep me around as his back up plan? If we can't date then why keep me around when we obviously have feelings for each other? My gut and my friends say that he's using the age difference to string me along as a backup plan. But I wanted other opinions to see what others thought. He's also shown jealousy when we hung out or I mentioned my ex after he did his.
Male friend claims age difference is an issue to date, but doesn't want to lose me as a friend, why keep me around at all?
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