Advice

I'm dating a man that is quite a bit older than I am. I'm 28 and he's 49. I've never been more in love. He left his wife shortly before we started dating, so he's still dealing with the divorce. I'm not really a jealous person, and knew that he was still in contact with his soon to be ex when we met, I am still friends with mine also....my problem is she calls him for help with the smallest stuff....a broken light switch, a stopped up sink...she even called him because to put air in her tire. I just feel like a lot of the things she "needs help" with are really just excuses to get him over there. He travels for work a lot, is sometimes gone for weeks at a time and as a result, we don't get much time together, half of which he spends dealing with her. He thinks I'm jealous or worries that they'll get back together, which is not true. He says she's just not as independent as I am and that he feels it's the right thing to do, but she has two brothers that from what I understand, have always looked out for her...would calling them be too crazy? Am I just jealous and don't know it or is he too soft hearted? He's also still paying half of ALL of her bills, including the note on a car she bought two weeks after he left.
***to answer some of the questions. 
He left her, though it was an amicable split. 
I have no problem with him paying his share of bills they accrued together, like credit cards and the house payment, the issue is the car payment, and the household things like power, water, cable etcetera that have been switched over into her name, in other words, things that he isn't there to use. Yes, I realize his finances are none of my business, so I say very little in the way of that, though he and I have discussed it. 
I have not met her but the impression I get from him and others, she does not seem like the vindictive type to just call him to keep him away from me. I seriously doubt she is just trying to get him back. 
The marriage ended because they just drifted apart, he said they both agreed it was a long time coming, which is why they have been so civil about it. Text messages between the two seem to say pretty much the same thing. 
My main concern is am I being overly jealous? He thinks I'm jealous, I think his sense of honor and kind heartedness has gotten out of hand. Who is right?