Wait 3 months, then both of you get tested, that way you'll conclusively know you're both negative and then do whatever you want. Use condoms until then, just in case because it's stupid to risk it.
You should always use condoms unless you have found someone you would like to only be having sex with for the rest of your life. I recommend you both go get a test done together.
USE CONDOMS until you know he is committed to you and HIV negative.