A lot of problems!!! help needed!!!

Where to start...well first of all i have been single now since may and its getting me down...i was due to get marride next year and my ex decided to cheat with an older women...am a single mum now and am starting to get my confiedence back after ex took it away...i have just started at a new job and there is this lad same age as me who i like....few probs here tho...because i have had to mature i see him as a little imature but his not his just actin his age...another one is ive started sleeping with him...which makes me happy but i dont kno whether he actually likes me or its just the sex...ive asked him loads of time but never gives me an answer....but he has given me little signs like...holding my hand...cuddeling me loads in bed....speaking his concerns about my weight and fact i dont eat...started calling me sexy etc....am just worried coz i can see my self getting really hurt and the job i love am gunna end up hating coz i work with him please help.....x