Help! “My Boyfriend Wants Me To Remain His Side Chick

This was shared …Read and drop your honest advice below;

I’m 24 years old, in a relationship with a 32 year old guy. The age isn’t the problem or that he has a kid whose mother is married to another man which is also not an issue. But He also has a girlfriend, he tells me he is not committed to her because she is off &on. But yet he has refused to leave her
his reason is because he doesn’t know if it will work out between him and I. I believe he should know what he wants and go for it… Probably he does and I’m just a side chick. I’m clueless as to what to do.. I keep letting him know I feel cheated and used and his response is that I make him feel guilty and then he digress. Please help me out. Thank you