The obvious questions here are:
Are you attracted to this particular guy?
And do you want to have a relationship with him?
If the answer to either (or both) of those is "no", then it's not going to be a good idea to get together with him.
And if the answer to both is "yes", then it sounds like a relationship is worth considering.
You don't have to decide your orientation before you can decide whether or not you want to be involved with a particular person.
(In fact, it's observing the gender of the people you want to be involved with that will generally tell you about your orientation ).