Completely indecisive

So i've been dateing this guy for the last four months and it just so happens he was my neighbor pretty much my whole life. We recently moved into an apartment together and everything seems ok but every relationship i have i seem to lose intrest. I can't help it. However, i usually get scared and run away but i want to be able to say i actually put effort into it. I need a new state of mind and a new look to go with it. lol ......So frustrating....