Advice would be so helpful.?

alright. so it has been about 2 months that my bestest guy friend as he was walkin away and he said [i love you] and i thought he was jokin so i said the same tho i was laughing.then afterwards he just plain got weird....like shyy? & now he really won't talk to me.......like if he does our convs. aren't long.last time we talked he was talkin to me about his feeling of how crappy week he was having. and he's not the type to open up.... and when ever i don't say hey. he'll say it.but in a shy way and he's always glaring at me....i mean i can see it for the coner of my eye......so i really don't get it? we were really thight. thoo the thing is i'm too shyy to ask what's wrong. what's Up? i need advice please.