if he is truly unhappy he will seek counseling and marriage therapy. if he talks to you its bc you are his life preserver. that means he feels comfortable talking to you because he's tested the waters and the fact that youre still talking to him gives him the impression that youre willing to participate in his selfish cheating behavior, he's found his fool. it may be intentional or subconscious on hid part.

think about it this way.. imagine he is some prisoner locked up in jail and you have a key. do you honestly think he will talk to you because youre awesome and he wants to get to know you better or does he want the key?
if he wants to be with you . he will do things right, end marriage, regain emotional stability, then seek you out.. thats if he truly would want it to work... but even if he does that you think he'll want to celebrate his new found freedom by getting into another relationship? hell. no.
had a friend who got married bc he was so desperate to find someone, bad choice. he went with some chick while married . i ran into him 2 years later. asked how he was doing... long story short he had a kid, not with his wife, not with the girl he cheated on her with, but with a conpletely new person! and guess what? he's not even with that girl anymore either. now he has a kid he barely sees bc he's fighting with the mother . as it turns out.. cheating chick relationship didnt work out, he ranway from that and he said he fell hard and fast for nee chick, had a kid . once that blissful moment faded the problems resurfaced. i got all that from 15 minutes of conversation. its not hard to find out what these guys are about.

imagine what the girls in his life feel and are going through, do you want to be on that list of the girls of this guy's past? bc its goig to happen.

nothing but time will reveal his true colors. for your own emotional sake, just seek someone else.

p.s. always trust your gut. if you have a bad feeling, abort. plus, about 95% of your serotonin is in your gut , its why its called the 2nd brain. if it tells you something is not right, trust it.