What should I do?

Almost 8months ago I got off a 6 year relationship with my ex. And now I'm talking to a close friend of his and it just happen out of no where. I added him on Instagram with no intentions of msging him. But he msged me first 3 days after. Now it's been almost 2 months since we started talking and I'm starting to grow feelings for him and he is as well. What should I do? I don't feel it's right and he doesn't either to do the fact that he's my ex bestfriend. But he says he doesn't mind putting his hands in the fire for me as long as he got an opportunity in my life. Mind you guys, he's the opposite of my ex , he's very respectful, mature, and over all he just sounds very smart. Help me!!! What should I do? I don't know if I should cut all ties with him or it's fine to keep going with this?
What should I do?
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