<human>: Can you condense the text into a few key points?

So, been seeing this guy on and off for last two years. Almost exactly a year ago he fell for a friend of mine. It was awkward hanging out the three of us. I could tell he liked her, he and she knew I liked him...
Fast forward to last spring, they childishly decide to stop talking to one another. At some point he starts talking to me again, and we end up in a kind of relationship for a couple months. He pulls away wanting to date others. 
All of a sudden hes going to dinners and concerts with her saying she owes him dinner for drinks at the concert..things like that. I begin to notice times he declines to hang out with me cause its "late" are also times she posts pictures of him online.

This other girl (24) and I both have sons that call each other best friends. They are both 4 and both really like hanging out with this guy. He told me because of this he feels an obligation to hang out with them, and hence us. He "likes us both, we have our faults and have our fun sides"...blah blah. But its like he is doing an every other day thing with us. I know he cuddles with her, dont think they have sex. He tries to cuddle with me, but the other night I basically said no, because I hate he hangs out with this girl I used to be friends with. Oh, he is the one that really pushed for me to drop her from my life. 

The peculier thing is he is constantly building me up. Trying to tell me that he would never let her keep him away from me, he would always defend me. Oh and he wants her and I to be friends again. He also goes out of his way to prove when he isnt with her...
<bot>: Guy I like seems to like ex best friend and is going out of his way to sooth my worries he is trying to bed/date her.