Dating

Am I crazy for falling for a guy 15 years younger? Should I give it a shot or will it inevitably just end up in misery/failure in the end?

Am I crazy for falling for a guy 15 years younger? Should I give it a shot or will it inevitably just end up in misery/failure in the end?
About 8-ish months ago I met an amazing guy at the gym. From the first time I saw him I thought he was super hot (with a smoking body). We loved each others company from the minute we started talking to each other. We have a ton of fun together and constantly made each other laugh. We have a lot in common and can talk to each other endlessly. However, our relationship is much deeper than just laughing together and going home. I feel incredibly safe confiding in him and seeking comfort from him (often when I don't feel safe doing so with anyone else). He was an amazing listener and really cares about what I say (even when no one else does). He constantly builds me up and made me feel great about myself. This is an especially big deal as I've just gotten out of a super emotionally (and a little physically) abusive marriage. I'm really trying to move on, but sometimes just find it difficult. This guy honestly builds confidence in me that I don't otherwise have. For a long time I denied my feelings for him and told myself we were just friends (for reasons I'll explain latter), but the connection and attraction between us grew more and more powerful. This last weekend my two daughters spent the weekend with their friends and we went out to eat (just as 'friends'). However, one thing led to another and we ended up sleeping together. We ended up spending the whole weekend together. It was amazing.
If I haven't made it clear enough already I'm massively attracted to him on an intensity level I don't think I've ever felt before. He's also made it clear he feels extremely attracted to me as well. However, there's a lot of other factors that still make me feel wildly conflicted. For one thing he's probably way too young for me (I'm 40 and he's 25). We're in very different stages of life that could be incompatible (I'm a single mom with two teenage girls and a career while he's a childless grad student) (there's more. Click to see the rest)
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I don't want to get caught up in some fling that will inevitably end. Part of me is worried this is just some midlife crisis problem and/or a rebound problem. My ex-husband constantly made me feel worthless, like a failure, and ugly/undesirable. Having a hot young muscular guy find me so unbelievably desirable (and constantly let me know it) honestly makes me feel super hot (which is something I haven't felt like in an extraordinarily long time).
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Moreover, our relationship goes even deeper than that as I just feel connected to him like I never have before. Part of me wonders if this is just a rebound made to make me feel better after my abusive marriage. I also am worried that if we started dating he'd eventually loose interest/attraction to me and leave me for some other hot younger woman. If I got with him I'd want it to be long term, and if he left me that would be heartbreaking.
Am I crazy for falling for a guy 15 years younger? Should I give it a shot or will it inevitably just end up in misery/failure in the end?
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