So Confused

Yesterday ( Thursday April 5, 2012 ), My Boyfriend & I got into a stupid argument. It all started Because I needed extra Help pushing another Buggy at Wal - Mart. He couldn't walk good because He was in Pain ( I understood that ) then My Son called and asked what I was doing. I told my Son that We ( My Boyfriend & I ) were going to Wal - Mart to go Grocery Shopping & I had to get some other things. So My son said he could meet Us up there around 2:30 p.m. and I told Him O.K.
I told My Boyfriend about what My son said. My boyfriend seemed like He got Mad then He said we will go around 1:40 p.m., I will go in with You and we will do it together. My son said He & His Girlfriend were just around the corner so My Son & His Girlfriend could meet Us there then My mom wanted to go too.
Well, To finish the argument I asked  His Brothers' Wife if she wouldn 't mind taking My Mom & Me. She said Yesterday. Well the argument stopped for a short time then later after I put the stuff away I went outside and Lordy Lordy Wholly Hell started.
He throw up everything that He has done for My Mom & I but He doesn' t think about ( He says He does ) what We done for Him like get Gas for all the trips ( Grocery Shopping, Paying Bills, Doctor 's Appt., Hospital Appts., Soda' s, Cigarettes' Etc.
We had 2 Bad Years ( 2010 & 2011 ) My Aunt passed away in June 2010, My Moms' Dog We had to put him down in March 2011, a New Neighbor ( We just Meet ) passed away 1 day before My Moms' dog then in April My Moms' Boyfriend of 33 Yrs. passed away and in June 2011 My Moms' Car caught on Fire that' s why We had to depend on My Boyfriend. I don' t like Depending on people because they always Break Your Heart. I want to really break - up with Him but If I do I will have to cancel My Therpist & stop getting My Medicine then where will I be.
Please give Me some advice & I am really in need.