Why does an ISP route this way?

So this is a traceroute from one of Bell Canada’s core routers in Montreal. (http://www.as577.net/en/page/lg.html)

So if I’m trying to get to a server in Halifax, from Montreal (http://www.ednet.ns.ca/), why would the traffic get routed to Toronto (core4-toronto21_POS0–0–2–0.net.bell.ca) and back to what’s likely the same data centre it started at in Montreal (ae8.bx01.mtrl.pq.aliant.net [Aliant is a subsidiary of Bell Canada])

traceroute to doeweb.ednet.ns.ca (142.227.127.125), 30 hops max, 38 byte packets
1 agg2-montreal02_ge11–1-7 (184.150.172.61) 0.238 ms 0.174 ms 0.156 ms
2 core4-montreal02_xe0–8-2–0_core.net.bell.ca (64.230.170.253) 12.380 ms 11.656 ms 8.346 ms
MPLS Label=18285 CoS=5 TTL=255 S=0
3 tcore4-toronto21_POS0–0-2–0.net.bell.ca (64.230.147.122) 12.769 ms 10.718 ms 12.369 ms
MPLS Label=17056 CoS=5 TTL=255 S=0
4 tcore4-torontoxn_HundredGigE0–12-0–0.net.bell.ca (64.230.50.19) 7.506 ms 8.281 ms 7.851 ms
MPLS Label=16314 CoS=5 TTL=255 S=0
5 dis3-torontoxn_10–0-0.net.bell.ca (64.230.97.139) 7.345 ms 8.236 ms 7.352 ms
6 67.69.211.22 (67.69.211.22) 7.299 ms 21.734 ms 25.701 ms
7 ae8.bx01.mtrl.pq.aliant.net (207.231.227.122) 7.236 ms 7.224 ms 8.041 ms
8 ae9.cr02.mctn.nb.aliant.net (207.231.227.125) 19.627 ms 19.607 ms 19.625 ms
9 be3.cr01.mctn.nb.aliant.net (142.166.185.137) 20.244 ms 20.234 ms 20.006 ms
10 be4.cr01.hlfx.ns.aliant.net (142.166.129.70) 23.756 ms 23.589 ms 23.675 ms
11 xe-1-0-0.gw01.hlfx.ns.aliant.net (142.176.53.115) 24.398 ms xe-0-0-0.gw01.hlfx.ns.aliant.net (142.176.53.99) 23.109 ms xe-1-0-0.gw01.hlfx.ns.aliant.net (142.176.53.115) 23.088 ms
12 142.176.119.18 (142.176.119.18) 23.143 ms 23.146 ms 23.148 ms
13 * * *
14 216.83.21.155 (216.83.21.155) 23.285 ms 23.265 ms 23.218 ms
15 eoc.ednet.ns.ca (142.227.51.30) 23.406 ms 23.371 ms 23.414 ms