My first thought about your "friend" is that he's not yet your "friend". He's someone that you met online and have talked with.
In situations like the ones most of us are in, we are extremely vulnerable to any opiate for our pain, anything to make it hurt just a little bit less. Just knowing that should make you extra weary.
May I ask where online you met him? I think that will qualify a lot of this.
There's nothing wrong with friends of the opposite sex. Especially if they were friends before your situation began. They'll lend you support in a really tough time.
I'd read Pyrite's post a few times over, there's a lot in there.
M 39 W 36 T5 M3 BD - 1/15 Separated - Same Day Served 9/15 D finalized 6/17