villain has 44+, two hearts, flopped straight
he doesn't have "overs" he has "overs and a flush draw" aka you're flipping at best and drawing thin at worst

you're putting in 24% of the pot, your equity is:
equity win tie pots won pots tied
Hand 0: 68.566% 64.49% 04.07% 46608 2945.00 { 44+, AhKh, Ah5h, Ah4h, 8h7h, 64s, 42s, 64o, 42o }
Hand 1: 31.434% 27.36% 04.07% 19772 2945.00 { 4c4d }

so it's a marginal call on the flop

but you're not so happy to hit a four or to hit your straight while the flush completes
what's your plan on a blank turn?