Oh hun im so sorry, coming from personal experience even though its hard, its better to let them go, so they can discover what they feel for you.
My boyfriend was the same, I would say I love you and he would find it really hard to say it back, he eventually broke up with me as he didnt know what he wanted in life, or if he wanted to be with me.
So we broke up, and then 8 mths later he was begging me to get back together with him, I wasnt ready to so we stayed friends, and eventually got back together, got married and now expecting our second child together.
Sometimes them loosing what they have is enough to make them realise what a good thing they had.
All the best
es