Stochastic Differential Equations with jumps

Hello every one, I'm working on Geometric Brownian motion, i bulid my code but it doesnt work as i want !!!! the two processes X and Y shouldnt cross each other, when the are about to meet should bounce away from each other. thats what i want to get. thanks in advance, this is my code below

clear variables
randn('state', 100)
mu = -2; mu2 = 2; sigma=1; sigma2=1; 
Xzero = 50; Yzero =10;   
Delta = 0.005; 
p = 10; N = 2^p; T = 1; dt = 1/N; n=1:N; 
% rnd = randn(1,N);
dW = sqrt(dt)*randn(1,N);     % Brownian increments
% dW = sqrt(dt)*rnd;     % Brownian increments
W = cumsum(dW);               % discretized Brownian path
Alpha = mu*([dt:dt:T])+sigma*W;
M = 2^p; S = 1; ds = 1/M;
dW2 = sqrt(ds)*randn(1,M);    % Brownian increments2
% dW2 = sqrt(ds)*rnd;    % Brownian increments2
W2 = cumsum(dW2); 
Betta = mu2*([ds:ds:S])+sigma2*W2;
A = log(Xzero)+ Alpha; B = log(Yzero)+ Betta; 
H=(-2*(n-1)*Delta);
D = (A-B); L =(n-1)*Delta;
X=zeros(size(n)); Y=X;
for ii=n
%     L(ii) =sum(n-1)*Delta;
%L(ii) =(ii-1)*Delta;
    if D(ii)>=H(ii)
        Bounce =0;
    else
        Bounce=L(ii);
    end
    X(ii) = Xzero*(exp(Alpha(ii)+Bounce));
    Y(ii) = Yzero*(exp(Betta(ii)-Bounce)); 
end
plot([0:dt:T],[Xzero,X],'b-'); hold on 
plot([0:ds:S],[Yzero,Y],'r-'); hold off
xlabel('Time')
ylabel('position')