Advice

So I've been dating this guy for a little over a month and I feel like he's really only dating me because I'm there. Like a month before we got together he got rejected by a girl and is still really bitter about it. When he's talking about her he uses phrases like she "crushed his heart". Also his laptop background is his ex from about 2 years ago and he won't change it even though he knows that I don't like it. Am I just over reacting or should I talk to him about these things?