@Lozkr
I could have written this a year ago. Our stories are sooo very similar, my guy kept it going for 10 years and would have kept going if I didn't finally say enough was enough.
He knew my feelings and would bread crumb me with I miss you's and small favors that I thought were what you did in a relationship, even though we weren't in one and he would remind me of this constantly.
He also borrowed money from me, which I was lucky enough to get back, but all that valuable time I wasted I never will.
It's harsh but it's simple. If he wanted to, he would. I realized I was a placeholder until someone he does want a relationship with comes along so I ended it because I deserve so much better than that and so do you.
Stop sleeping with him, get your money back if possible, and walk away with your pride still intact, if he was your best friend he wouldn't be using you.
You will meet someone, a real relationship is not like this. 