You're just hesitant. If you think he's a good person based on your observation and most important is if you think that you like him too, why not be his gf? Don't mind the IF's, it won't go away, everything has it.
You will not be able to know until you try. Anyway you're not marrying him yet, you're just gonna allow both of you to show how really love works on you two.
If you like him also and then you don't want to give chance for it, you will just make him suffer and you will feel the same as well.
Anyway have you tried having a boyfriend TS?