Break up - will I get the $ he owes me?

Just broke up with my boyfriend of 3 years and I'm devastated. Hurt, sad and angry. His ex-wife was constantly above me and in our lives every day (wasn't even about his kids... He just couldn't say no to her). Yet I bent and dealt with her bs, and he got mad at me for blowing up bc after k finally had enough!!! She was a narcissist crazy person. She even owed him money but he was too chicken to ask for it. She walked all over him.

So we went on a trip last month. I wanted it to be just us, but he insisted his kids go as well. I took a loan out that both of us were going to pay for so it could happen.

Then we broke up last week (because of his ex which he denies) and now he's dragging his feet paying his portion. I told him to get the money his ex owes him and then he only has half to worry about. Gave him a month deadline.

He told me he'd use his tax return (if he even gets one). Funny because he filed late last year and didn't get much of a return. This is BS and I have every right to be angry! He has never followed through on a promise and I'm upset with myself for even trying to make things work.

Why does love suck so bad? I'm never going to see my money. So disappointed in myself.