my ex boyfriends best friend

I was seeing a guy for about 2 months and lost my virginity to him. Their wasn't much of connection and he wouldn't reply to my texts and he'd lie to me and hang out with his friends. I would see him once a week. So I broke things off with him, he's not upset but I am.
His best friend has recently shown interest in me, (me and his friend have been broken up for about a week) but he has a girlfriend and has for about a year or so. He doesn't seem very happy and doesn't speak highly of her.
He suggested we hang out sometime and he's been texting and snapchatting me a lot . 
Would it be wrong of me to hang out with him? 

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