<human>: Alright, that title may have sounded a bit abrasive, but essentially, it is what I'm struggling to deal with. I have been seeing my guy for about 3 months now and every now and then when I have random insecurity flare-ups we would have little talks about them. 

Examples:

* Lately he's been "too tired" to have sex. I explained to him how that made me feel undesireable, which he brushed off as silliness on my part. He expects me to know that he is in fact very attracted to me. He just started a new job and is trying to get accustomed to the workload and schedule and thus has been feeling too tired to have sex. (But apparently not tired enough to receive oral)

* When we were together this evening, he ignored a call. This isn't the first time he's done this. My insecure self suspected that it may be his ex, so I asked him if he ignores people often. He said yes. When I asked why, his response was that people should know that he'll get back to them on his own time or that they shouldn't be mad when he ignores them because it means that he is busy (we were watching tv at the time)

* I slept over one night, had sexytimes a couple times throughout the night. But he asked me to leave around 7am because apparently he hadn't gotten a wink of sleep (he doesn't like touching others when he sleeps) and had to be at work shortly. 

Generally, he does things on his own time, all the time. He admitted to me that his first priority in life ever is himself. As much as it sucks for me to deal with his personality type that requires a lot of space, I really like the guy and want to make things work. 

How can I be assertive without being too demanding with this guy?

Condense the text into a few key points
<bot>: My affectionate, giving personality clashes with my boyfriend's "me first" personality because sometimes it makes me feel like a nuisance. How can I make this work?