Boyfriend trouble

My boyfriend is making every excuse under the sun not to spend time with me. We've only had sex twice and have been going out for 3 months, he talks about how much he wants it bit doesnt make the effort to come and see me. He literally works 30 seconds from me and lives 15 minutes away. 
Everytime he gets the feeling that im going to break up with him he starts pleading with me to give him time to sort his life out and become a better boyfriend. Whatbshould i do?