Why would my ex add me back on all social media again?

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I saw him the other day for the first time in months. He has a new girlfriend and I honestly really like her and I'm not jealous whatsoever and he was the one who broke things off with me for no reason at all and decided to delete me off social media. Ever since I saw him he won't stop snap chatting me and I won't snap him back because he's in a relationship and I actually respect his girlfriend. And he they seem really happy I just don't know why he's trying to get my attention I mean ever since we broke up I've really been taking care of myself eating healthy and really going to the gym so I know I look way hotter than I use to.
Why would my ex add me back on all social media again?
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