Well you sound bothered by the lack of commitment which makes me think you care about the relationship and want it to go somewhere?
To be honest, saying i love you is a waste of time at first. I said it after 4 months, and then later realised i only actually ment it after a year.
4 months is a short time to be with something, and usually, my friends who meet boys and after a few weeks start telling everyone how much they love them end up single. Not because the boys get scared, but just because they thought they knew the person when they actually didnt.
Why dont you try talking to your bf and try and find out how much he likes you.
Some boys just arent comfortable declaring their love for somebody, or maybe he's just abit more mature than putting 'I love whoever' in their msn name, either way it doesnt mean he doesnt care about you.
4 months is still early days, i think. But you should be able to talk to him about it.