<human>: Can you condense the text into a few key points?

I've been in this relationship for 8 months now. We live an hour away and have been seeing each other once a month to now every 2 weeks to improve our relationship. I know I am really closed to him and he tells me all of the time. I get so stressed when I know I am meeting up with him or whenever my phone buzzes I get super stressed knowing that its probably him.
 I've been in couple of relationships before (and they were short) and I didn't like the guys, I just went out with them so that I could say I was not single. Its not like that with this guy, I know I like him and I'm trying but I'm just so stressed that I can't even open up to him.

Today he texted me saying that he is not really a part of my life. What I took from that was I'm not involving him with my life, I keep him away. We've been together 8 months and the furthest our relationship has gone is sleeping in the same bed and rarely kiss. 

I guess what I really want is some advice on what to do.
<bot>: I get too stressed in relationships and I want it to work with this guy but I don't know how to open up to him.