He told me HE had feelings for me

So I have this study buddy in uni. We are in the same class, same modules and do everything together. We have been in this state for 7-8 months and my gfriends have started questioning me about him.

Honestly I just need someone to push to through uni and keep me in check.

Recently he asked me if I had feelings him, lost for words I just replied yes and proceeded to place my hand on his.

I at first didn’t have feelings but then after thinking about all the time we have spent together, I wouldnt want it to all go to waste.

I guess we are together now, what should I do? How are relationships made official.