will our relationship turn purely physical after this?

Wait untill the 5-6 month mark would be a good idea

don't do it then!

That's impossible to tell. You have to go with your gut and decide if you like him and trust him. If you do then go for it and hope for the best. But 2 months isn't that long so you may want to give it some time. And why not see if he is willing to do the same for you to show he is not selfish or just looking ot please himself.

Then don't do it. Simple solution.