What is going on with this?

hi can i have some advice
i split with my ex last year after finding out his engaged
im still in love and very much attracted to him

the thing is in January he contacted me we chatted and kissed i know shouldn't of but we did, from February we been sleeping together meeting up sometimes weekly than drifter to fornightly and than monthly

i saw him June 5th got odd text off him so thought ill try and move on i been going on dates with another guy but im not 100 percent into him i dont get excited when he texts but im hoping it grow on me anyway

my ex suddenly contacted me after 2 months of not seeing him 3 weeks of no texts and i dropped everything to go spend time with him this passed weekend i text him yesterday I've had no reply again
i also said is this friends with benefits he said no its more than that

he's 20 years older than his fiance (she lives with mum still) has not got a house/flat he rents a single room out but always doing something on his car, is unemployed too
he has promised his fiance kids and a home together but told me he dont want anymore kids he has 5 already from 2 different mothers

he also knows im sort of dating someone but I've not told him its not going well
What is going on with this?
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