Help now! easy 10 pts! what do with ex bf?

ex and i have been broken up for months and we went through a whole no contact phase for 2 months. christmas came and we started to talk just as friends. he texted me on xmas: merry xmas and i still luv you. so we talk every few days now... 2 months ago he told me that right now, he doesnt have time for a gf with school(ap classes), track, and work, and getting ready for college(coming to my college in the fall...im a college fresh btw). He has talked to a couple girls but he is still single..I wonder why? I stayed at the dorm this past weekend and had plans..he had his senior prom and he was bummed about something his status said:"U can only love what u got and wats guarenteed... So i guess pole vaulting is my only love... Sometimes it bttr to hve low expectations, cuz gttn let dwn sux..." idk whats up i asked him how was prom and he told me he didnt wanna talk about it and he said dont worry it has nothin to do with you. and i saw pictures of him dancing with these girls and im jealous..do i just stop bein jealous and not ruin my chances of gettin back together with him over the summer or do i give up help me please thanks!