Gal,i feel u,honestly.And u aint over-reacting.Was in the same situation like 7months ago.The things is,there's no more communication btn u two anymore like it used to be,right?Thats a sign that he is distanting himself from you.I know u feel like u want to ask him whether he seeing someone,but just hold it alittle till u have something in your hands to support ur assumptions.It can be he seeing someone else out there without ur knowledge or he just need his space.As much as us chiqs like attention from our men,men also like their space.But a higher percentage is that he wants out but he doesn't know how to tell you coz he probably don't want to hurt your feelings especially if he knows how much u love him and how loyal u are.
Maybe he is just being a coward.Take this time to brace urself for anything,set ur mind in away that u won't be so much devastated if he eventually breaks up with you.Atleast u will be ready for it and will take lesser time to heal.
Just take it cool,and if he doesn't show any signs of u two talking,just meet with him at his place un annouced and try to ask what changed in ur communication.I believe communication is the key to any kind of healthy relationship.Ask what's going wrong for him to shun u just like that.And give him room to talk,be very calm and he might even tell you honestly whats really cutting.
Trust me,it might work on you,it worked for me.
All the best galfriend.

Hi,am a jamaa too and sometiomes l just feel like l don't want to see ma galfrnd.Sometimes,we the jammaz feel like you the chicks are to much on us n need sometime away thus not spending time with you.On the other side,if your jamaa makes it a habit its clear he is doing something behind your back.If he only see's your at his only time(i.e. when he wants only) its clear too he is doing something.Also l would wish you n your sisters would give us some time.