Dealing with over eating and breakups...

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I am a lot stronger over many situations now and always work out my anger or sadness but when it comes to affairs of the heart I can't control myself! I wont give the whole story because it's silly, all I will give is key points.

Me + him = 3 years. / continents + effort but the effort was negative (we were together 3 years, then ended up in different continents, we tried for a long time but the efforts weren't enough) so yeah, I still love him and I get myself over emotional sometimes, not often, but sometimes. I know logically 3 years is nothing compared to relationships that have lasted so much longer, and also marriages etc. But it still hurts.

I know I could just say it's one day and not let it get to me, but I just don't want bad foods to be my crutch anymore.

So just looking for advice I guess. I know the answer is to exercise instead, but how do you motivate yourself to workout instead of reaching for the junk when it feels so much more easier and tempting?